diff --git a/assets/l10n/app_en.arb b/assets/l10n/app_en.arb
index 58822303fd..a370a00105 100644
--- a/assets/l10n/app_en.arb
+++ b/assets/l10n/app_en.arb
@@ -56,6 +56,10 @@
   "@profileButtonSendDirectMessage": {
     "description": "Label for button in profile screen to navigate to DMs with the shown user."
   },
+  "errorShowUserProfile": "Could not show user profile.",
+  "@errorShowUserProfile": {
+    "description": "Message that appears on the user profile page when the profile cannot be shown."
+  },
   "permissionsNeededTitle": "Permissions needed",
   "@permissionsNeededTitle": {
     "description": "Title for dialog asking the user to grant additional permissions."
@@ -321,8 +325,8 @@
   "@composeBoxSendTooltip":  {
     "description": "Tooltip for send button in compose box."
   },
-  "composeBoxUnknownChannelName": "(unknown channel)",
-  "@composeBoxUnknownChannelName": {
+  "unknownChannelName": "(unknown channel)",
+  "@unknownChannelName": {
     "description": "Replacement name for channel when it cannot be found in the store."
   },
   "composeBoxTopicHintText": "Topic",
@@ -340,6 +344,10 @@
   "@unknownUserName": {
     "description": "Name placeholder to use for a user when we don't know their name."
   },
+  "messageListYouWithYourselfTitle": "DMs with yourself",
+  "@messageListYouWithYourselfTitle": {
+    "description": "Message list page title for a DM group that only includes yourself."
+  },
   "messageListGroupYouAndOthers": "You and {others}",
   "@messageListGroupYouAndOthers": {
     "description": "Message list recipient header for a DM group with others.",
@@ -610,6 +618,14 @@
   "@channelFeedButtonTooltip": {
     "description": "Tooltip for button to navigate to a given channel's feed"
   },
+  "notifChannelConversationLabel": "#{channel} > {topic}",
+  "@notifChannelConversationLabel": {
+    "description": "Label for a channel conversation notification.",
+    "placeholders": {
+      "channel": {"type": "String", "example": "channel name"},
+      "topic": {"type": "String", "example": "topic name"}
+    }
+  },
   "notifGroupDmConversationLabel": "{senderFullName} to you and {numOthers, plural, =1{1 other} other{{numOthers} others}}",
   "@notifGroupDmConversationLabel": {
     "description": "Label for a group DM conversation notification.",
@@ -618,6 +634,18 @@
       "numOthers": {"type": "int", "example": "4"}
     }
   },
+  "pinnedSubscriptionsLabel": "Pinned",
+  "@pinnedSubscriptionsLabel": {
+    "description": "Label for the list of pinned subscribed channels."
+  },
+  "unpinnedSubscriptionsLabel": "Unpinned",
+  "@unpinnedSubscriptionsLabel": {
+    "description": "Label for the list of unpinned subscribed channels."
+  },
+  "noSubscriptions": "No channels found",
+  "@noSubscriptions": {
+    "description": "Text to display when there are no subscribed channels."
+  },
   "notifSelfUser": "You",
   "@notifSelfUser": {
     "description": "Display name for the user themself, to show after replying in an Android notification"
diff --git a/lib/generated/l10n/zulip_localizations.dart b/lib/generated/l10n/zulip_localizations.dart
index 00d7cfde72..b9eef21071 100644
--- a/lib/generated/l10n/zulip_localizations.dart
+++ b/lib/generated/l10n/zulip_localizations.dart
@@ -187,6 +187,12 @@ abstract class ZulipLocalizations {
   /// **'Send direct message'**
   String get profileButtonSendDirectMessage;
 
+  /// Message that appears on the user profile page when the profile cannot be shown.
+  ///
+  /// In en, this message translates to:
+  /// **'Could not show user profile.'**
+  String get errorShowUserProfile;
+
   /// Title for dialog asking the user to grant additional permissions.
   ///
   /// In en, this message translates to:
@@ -533,7 +539,7 @@ abstract class ZulipLocalizations {
   ///
   /// In en, this message translates to:
   /// **'(unknown channel)'**
-  String get composeBoxUnknownChannelName;
+  String get unknownChannelName;
 
   /// Hint text for topic input widget in compose box.
   ///
@@ -553,6 +559,12 @@ abstract class ZulipLocalizations {
   /// **'(unknown user)'**
   String get unknownUserName;
 
+  /// Message list page title for a DM group that only includes yourself.
+  ///
+  /// In en, this message translates to:
+  /// **'DMs with yourself'**
+  String get messageListYouWithYourselfTitle;
+
   /// Message list recipient header for a DM group with others.
   ///
   /// In en, this message translates to:
@@ -925,12 +937,36 @@ abstract class ZulipLocalizations {
   /// **'Channel feed'**
   String get channelFeedButtonTooltip;
 
+  /// Label for a channel conversation notification.
+  ///
+  /// In en, this message translates to:
+  /// **'#{channel} > {topic}'**
+  String notifChannelConversationLabel(String channel, String topic);
+
   /// Label for a group DM conversation notification.
   ///
   /// In en, this message translates to:
   /// **'{senderFullName} to you and {numOthers, plural, =1{1 other} other{{numOthers} others}}'**
   String notifGroupDmConversationLabel(String senderFullName, int numOthers);
 
+  /// Label for the list of pinned subscribed channels.
+  ///
+  /// In en, this message translates to:
+  /// **'Pinned'**
+  String get pinnedSubscriptionsLabel;
+
+  /// Label for the list of unpinned subscribed channels.
+  ///
+  /// In en, this message translates to:
+  /// **'Unpinned'**
+  String get unpinnedSubscriptionsLabel;
+
+  /// Text to display when there are no subscribed channels.
+  ///
+  /// In en, this message translates to:
+  /// **'No channels found'**
+  String get noSubscriptions;
+
   /// Display name for the user themself, to show after replying in an Android notification
   ///
   /// In en, this message translates to:
diff --git a/lib/generated/l10n/zulip_localizations_ar.dart b/lib/generated/l10n/zulip_localizations_ar.dart
index 542b85031b..2fac2565af 100644
--- a/lib/generated/l10n/zulip_localizations_ar.dart
+++ b/lib/generated/l10n/zulip_localizations_ar.dart
@@ -52,6 +52,9 @@ class ZulipLocalizationsAr extends ZulipLocalizations {
   @override
   String get profileButtonSendDirectMessage => 'Send direct message';
 
+  @override
+  String get errorShowUserProfile => 'Could not show user profile.';
+
   @override
   String get permissionsNeededTitle => 'Permissions needed';
 
@@ -256,7 +259,7 @@ class ZulipLocalizationsAr extends ZulipLocalizations {
   String get composeBoxSendTooltip => 'Send';
 
   @override
-  String get composeBoxUnknownChannelName => '(unknown channel)';
+  String get unknownChannelName => '(unknown channel)';
 
   @override
   String get composeBoxTopicHintText => 'Topic';
@@ -269,6 +272,9 @@ class ZulipLocalizationsAr extends ZulipLocalizations {
   @override
   String get unknownUserName => '(unknown user)';
 
+  @override
+  String get messageListYouWithYourselfTitle => 'DMs with yourself';
+
   @override
   String messageListGroupYouAndOthers(String others) {
     return 'You and $others';
@@ -481,6 +487,11 @@ class ZulipLocalizationsAr extends ZulipLocalizations {
   @override
   String get channelFeedButtonTooltip => 'Channel feed';
 
+  @override
+  String notifChannelConversationLabel(String channel, String topic) {
+    return '#$channel > $topic';
+  }
+
   @override
   String notifGroupDmConversationLabel(String senderFullName, int numOthers) {
     String _temp0 = intl.Intl.pluralLogic(
@@ -492,6 +503,15 @@ class ZulipLocalizationsAr extends ZulipLocalizations {
     return '$senderFullName to you and $_temp0';
   }
 
+  @override
+  String get pinnedSubscriptionsLabel => 'Pinned';
+
+  @override
+  String get unpinnedSubscriptionsLabel => 'Unpinned';
+
+  @override
+  String get noSubscriptions => 'No channels found';
+
   @override
   String get notifSelfUser => 'You';
 
diff --git a/lib/generated/l10n/zulip_localizations_en.dart b/lib/generated/l10n/zulip_localizations_en.dart
index b6bc9f72e7..7918499a8a 100644
--- a/lib/generated/l10n/zulip_localizations_en.dart
+++ b/lib/generated/l10n/zulip_localizations_en.dart
@@ -52,6 +52,9 @@ class ZulipLocalizationsEn extends ZulipLocalizations {
   @override
   String get profileButtonSendDirectMessage => 'Send direct message';
 
+  @override
+  String get errorShowUserProfile => 'Could not show user profile.';
+
   @override
   String get permissionsNeededTitle => 'Permissions needed';
 
@@ -256,7 +259,7 @@ class ZulipLocalizationsEn extends ZulipLocalizations {
   String get composeBoxSendTooltip => 'Send';
 
   @override
-  String get composeBoxUnknownChannelName => '(unknown channel)';
+  String get unknownChannelName => '(unknown channel)';
 
   @override
   String get composeBoxTopicHintText => 'Topic';
@@ -269,6 +272,9 @@ class ZulipLocalizationsEn extends ZulipLocalizations {
   @override
   String get unknownUserName => '(unknown user)';
 
+  @override
+  String get messageListYouWithYourselfTitle => 'DMs with yourself';
+
   @override
   String messageListGroupYouAndOthers(String others) {
     return 'You and $others';
@@ -481,6 +487,11 @@ class ZulipLocalizationsEn extends ZulipLocalizations {
   @override
   String get channelFeedButtonTooltip => 'Channel feed';
 
+  @override
+  String notifChannelConversationLabel(String channel, String topic) {
+    return '#$channel > $topic';
+  }
+
   @override
   String notifGroupDmConversationLabel(String senderFullName, int numOthers) {
     String _temp0 = intl.Intl.pluralLogic(
@@ -492,6 +503,15 @@ class ZulipLocalizationsEn extends ZulipLocalizations {
     return '$senderFullName to you and $_temp0';
   }
 
+  @override
+  String get pinnedSubscriptionsLabel => 'Pinned';
+
+  @override
+  String get unpinnedSubscriptionsLabel => 'Unpinned';
+
+  @override
+  String get noSubscriptions => 'No channels found';
+
   @override
   String get notifSelfUser => 'You';
 
diff --git a/lib/generated/l10n/zulip_localizations_fr.dart b/lib/generated/l10n/zulip_localizations_fr.dart
index c857da2c82..5079caad41 100644
--- a/lib/generated/l10n/zulip_localizations_fr.dart
+++ b/lib/generated/l10n/zulip_localizations_fr.dart
@@ -52,6 +52,9 @@ class ZulipLocalizationsFr extends ZulipLocalizations {
   @override
   String get profileButtonSendDirectMessage => 'Send direct message';
 
+  @override
+  String get errorShowUserProfile => 'Could not show user profile.';
+
   @override
   String get permissionsNeededTitle => 'Permissions needed';
 
@@ -256,7 +259,7 @@ class ZulipLocalizationsFr extends ZulipLocalizations {
   String get composeBoxSendTooltip => 'Send';
 
   @override
-  String get composeBoxUnknownChannelName => '(unknown channel)';
+  String get unknownChannelName => '(unknown channel)';
 
   @override
   String get composeBoxTopicHintText => 'Topic';
@@ -269,6 +272,9 @@ class ZulipLocalizationsFr extends ZulipLocalizations {
   @override
   String get unknownUserName => '(unknown user)';
 
+  @override
+  String get messageListYouWithYourselfTitle => 'DMs with yourself';
+
   @override
   String messageListGroupYouAndOthers(String others) {
     return 'You and $others';
@@ -481,6 +487,11 @@ class ZulipLocalizationsFr extends ZulipLocalizations {
   @override
   String get channelFeedButtonTooltip => 'Channel feed';
 
+  @override
+  String notifChannelConversationLabel(String channel, String topic) {
+    return '#$channel > $topic';
+  }
+
   @override
   String notifGroupDmConversationLabel(String senderFullName, int numOthers) {
     String _temp0 = intl.Intl.pluralLogic(
@@ -492,6 +503,15 @@ class ZulipLocalizationsFr extends ZulipLocalizations {
     return '$senderFullName to you and $_temp0';
   }
 
+  @override
+  String get pinnedSubscriptionsLabel => 'Pinned';
+
+  @override
+  String get unpinnedSubscriptionsLabel => 'Unpinned';
+
+  @override
+  String get noSubscriptions => 'No channels found';
+
   @override
   String get notifSelfUser => 'You';
 
diff --git a/lib/generated/l10n/zulip_localizations_ja.dart b/lib/generated/l10n/zulip_localizations_ja.dart
index 7adbc9ae8a..dce85b0148 100644
--- a/lib/generated/l10n/zulip_localizations_ja.dart
+++ b/lib/generated/l10n/zulip_localizations_ja.dart
@@ -52,6 +52,9 @@ class ZulipLocalizationsJa extends ZulipLocalizations {
   @override
   String get profileButtonSendDirectMessage => 'ダイレクトメッセージを送信';
 
+  @override
+  String get errorShowUserProfile => 'Could not show user profile.';
+
   @override
   String get permissionsNeededTitle => 'Permissions needed';
 
@@ -256,7 +259,7 @@ class ZulipLocalizationsJa extends ZulipLocalizations {
   String get composeBoxSendTooltip => 'Send';
 
   @override
-  String get composeBoxUnknownChannelName => '(unknown channel)';
+  String get unknownChannelName => '(unknown channel)';
 
   @override
   String get composeBoxTopicHintText => 'Topic';
@@ -269,6 +272,9 @@ class ZulipLocalizationsJa extends ZulipLocalizations {
   @override
   String get unknownUserName => '(unknown user)';
 
+  @override
+  String get messageListYouWithYourselfTitle => 'DMs with yourself';
+
   @override
   String messageListGroupYouAndOthers(String others) {
     return 'You and $others';
@@ -481,6 +487,11 @@ class ZulipLocalizationsJa extends ZulipLocalizations {
   @override
   String get channelFeedButtonTooltip => 'Channel feed';
 
+  @override
+  String notifChannelConversationLabel(String channel, String topic) {
+    return '#$channel > $topic';
+  }
+
   @override
   String notifGroupDmConversationLabel(String senderFullName, int numOthers) {
     String _temp0 = intl.Intl.pluralLogic(
@@ -492,6 +503,15 @@ class ZulipLocalizationsJa extends ZulipLocalizations {
     return '$senderFullName to you and $_temp0';
   }
 
+  @override
+  String get pinnedSubscriptionsLabel => 'Pinned';
+
+  @override
+  String get unpinnedSubscriptionsLabel => 'Unpinned';
+
+  @override
+  String get noSubscriptions => 'No channels found';
+
   @override
   String get notifSelfUser => 'You';
 
diff --git a/lib/generated/l10n/zulip_localizations_pl.dart b/lib/generated/l10n/zulip_localizations_pl.dart
index 07746b3f27..bfb0d6cc78 100644
--- a/lib/generated/l10n/zulip_localizations_pl.dart
+++ b/lib/generated/l10n/zulip_localizations_pl.dart
@@ -52,6 +52,9 @@ class ZulipLocalizationsPl extends ZulipLocalizations {
   @override
   String get profileButtonSendDirectMessage => 'Wyślij wiadomość bezpośrednią';
 
+  @override
+  String get errorShowUserProfile => 'Could not show user profile.';
+
   @override
   String get permissionsNeededTitle => 'Wymagane uprawnienia';
 
@@ -256,7 +259,7 @@ class ZulipLocalizationsPl extends ZulipLocalizations {
   String get composeBoxSendTooltip => 'Wyślij';
 
   @override
-  String get composeBoxUnknownChannelName => '(nieznany kanał)';
+  String get unknownChannelName => '(unknown channel)';
 
   @override
   String get composeBoxTopicHintText => 'Wątek';
@@ -269,6 +272,9 @@ class ZulipLocalizationsPl extends ZulipLocalizations {
   @override
   String get unknownUserName => '(nieznany użytkownik)';
 
+  @override
+  String get messageListYouWithYourselfTitle => 'DMs with yourself';
+
   @override
   String messageListGroupYouAndOthers(String others) {
     return 'Ty i $others';
@@ -481,6 +487,11 @@ class ZulipLocalizationsPl extends ZulipLocalizations {
   @override
   String get channelFeedButtonTooltip => 'Strumień kanału';
 
+  @override
+  String notifChannelConversationLabel(String channel, String topic) {
+    return '#$channel > $topic';
+  }
+
   @override
   String notifGroupDmConversationLabel(String senderFullName, int numOthers) {
     String _temp0 = intl.Intl.pluralLogic(
@@ -492,6 +503,15 @@ class ZulipLocalizationsPl extends ZulipLocalizations {
     return '$senderFullName do ciebie i $_temp0';
   }
 
+  @override
+  String get pinnedSubscriptionsLabel => 'Pinned';
+
+  @override
+  String get unpinnedSubscriptionsLabel => 'Unpinned';
+
+  @override
+  String get noSubscriptions => 'No channels found';
+
   @override
   String get notifSelfUser => 'Ty';
 
diff --git a/lib/generated/l10n/zulip_localizations_ru.dart b/lib/generated/l10n/zulip_localizations_ru.dart
index 9c2065376b..040e1d93fb 100644
--- a/lib/generated/l10n/zulip_localizations_ru.dart
+++ b/lib/generated/l10n/zulip_localizations_ru.dart
@@ -52,6 +52,9 @@ class ZulipLocalizationsRu extends ZulipLocalizations {
   @override
   String get profileButtonSendDirectMessage => 'Отправить личное сообщение';
 
+  @override
+  String get errorShowUserProfile => 'Could not show user profile.';
+
   @override
   String get permissionsNeededTitle => 'Требуются разрешения';
 
@@ -256,7 +259,7 @@ class ZulipLocalizationsRu extends ZulipLocalizations {
   String get composeBoxSendTooltip => 'Send';
 
   @override
-  String get composeBoxUnknownChannelName => '(unknown channel)';
+  String get unknownChannelName => '(unknown channel)';
 
   @override
   String get composeBoxTopicHintText => 'Topic';
@@ -269,6 +272,9 @@ class ZulipLocalizationsRu extends ZulipLocalizations {
   @override
   String get unknownUserName => '(unknown user)';
 
+  @override
+  String get messageListYouWithYourselfTitle => 'DMs with yourself';
+
   @override
   String messageListGroupYouAndOthers(String others) {
     return 'You and $others';
@@ -481,6 +487,11 @@ class ZulipLocalizationsRu extends ZulipLocalizations {
   @override
   String get channelFeedButtonTooltip => 'Channel feed';
 
+  @override
+  String notifChannelConversationLabel(String channel, String topic) {
+    return '#$channel > $topic';
+  }
+
   @override
   String notifGroupDmConversationLabel(String senderFullName, int numOthers) {
     String _temp0 = intl.Intl.pluralLogic(
@@ -492,6 +503,15 @@ class ZulipLocalizationsRu extends ZulipLocalizations {
     return '$senderFullName to you and $_temp0';
   }
 
+  @override
+  String get pinnedSubscriptionsLabel => 'Pinned';
+
+  @override
+  String get unpinnedSubscriptionsLabel => 'Unpinned';
+
+  @override
+  String get noSubscriptions => 'No channels found';
+
   @override
   String get notifSelfUser => 'You';
 
diff --git a/lib/notifications/display.dart b/lib/notifications/display.dart
index 46ea95486a..35f1b0ecc8 100644
--- a/lib/notifications/display.dart
+++ b/lib/notifications/display.dart
@@ -263,9 +263,10 @@ class NotificationDisplayManager {
     // the first.
     messagingStyle.conversationTitle = switch (data.recipient) {
       FcmMessageChannelRecipient(:var streamName?, :var topic) =>
-        '#$streamName > $topic',
+        zulipLocalizations.notifChannelConversationLabel(streamName, topic),
       FcmMessageChannelRecipient(:var topic) =>
-        '#(unknown channel) > $topic', // TODO get stream name from data
+        zulipLocalizations.notifChannelConversationLabel(
+          zulipLocalizations.unknownChannelName, topic), // TODO get stream name from data
       FcmMessageDmRecipient(:var allRecipientIds) when allRecipientIds.length > 2 =>
         zulipLocalizations.notifGroupDmConversationLabel(
           data.senderFullName, allRecipientIds.length - 2), // TODO use others' names, from data
diff --git a/lib/widgets/app.dart b/lib/widgets/app.dart
index 75fec7bc8b..9525dffdfe 100644
--- a/lib/widgets/app.dart
+++ b/lib/widgets/app.dart
@@ -323,6 +323,7 @@ class ChooseAccountPageOverflowButton extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
+    final zulipLocalizations = ZulipLocalizations.of(context);
     final materialLocalizations = MaterialLocalizations.of(context);
     return MenuAnchor(
       menuChildren: [
@@ -330,7 +331,7 @@ class ChooseAccountPageOverflowButton extends StatelessWidget {
           onPressed: () {
             Navigator.push(context, AboutZulipPage.buildRoute(context));
           },
-          child: const Text('About Zulip')), // TODO(i18n)
+          child: Text(zulipLocalizations.aboutPageTitle)),
       ],
       builder: (BuildContext context, MenuController controller, Widget? child) {
         return IconButton(
diff --git a/lib/widgets/compose_box.dart b/lib/widgets/compose_box.dart
index 114e392bc7..2e05b6aec9 100644
--- a/lib/widgets/compose_box.dart
+++ b/lib/widgets/compose_box.dart
@@ -483,7 +483,7 @@ class _StreamContentInputState extends State<_StreamContentInput> {
     final store = PerAccountStoreWidget.of(context);
     final zulipLocalizations = ZulipLocalizations.of(context);
     final streamName = store.streams[widget.narrow.streamId]?.name
-      ?? zulipLocalizations.composeBoxUnknownChannelName;
+      ?? zulipLocalizations.unknownChannelName;
     return _ContentInput(
       narrow: widget.narrow,
       destination: TopicNarrow(widget.narrow.streamId, _topicTextNormalized),
@@ -545,7 +545,7 @@ class _FixedDestinationContentInput extends StatelessWidget {
       case TopicNarrow(:final streamId, :final topic):
         final store = PerAccountStoreWidget.of(context);
         final streamName = store.streams[streamId]?.name
-          ?? zulipLocalizations.composeBoxUnknownChannelName;
+          ?? zulipLocalizations.unknownChannelName;
         return zulipLocalizations.composeBoxChannelContentHint(streamName, topic);
 
       case DmNarrow(otherRecipientIds: []): // The self-1:1 thread.
diff --git a/lib/widgets/emoji_reaction.dart b/lib/widgets/emoji_reaction.dart
index 98147a54d7..5c1b855c2a 100644
--- a/lib/widgets/emoji_reaction.dart
+++ b/lib/widgets/emoji_reaction.dart
@@ -149,6 +149,7 @@ class ReactionChip extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     final store = PerAccountStoreWidget.of(context);
+    final zulipLocalizations = ZulipLocalizations.of(context);
 
     final reactionType = reactionWithVotes.reactionType;
     final emojiCode = reactionWithVotes.emojiCode;
@@ -163,7 +164,7 @@ class ReactionChip extends StatelessWidget {
       ? userIds.map((id) {
           return id == store.selfUserId
             ? 'You'
-            : store.users[id]?.fullName ?? '(unknown user)'; // TODO(i18n)
+            : store.users[id]?.fullName ?? zulipLocalizations.unknownUserName;
         }).join(', ')
       : userIds.length.toString();
 
diff --git a/lib/widgets/inbox.dart b/lib/widgets/inbox.dart
index 12ec8751a1..ad74c47c12 100644
--- a/lib/widgets/inbox.dart
+++ b/lib/widgets/inbox.dart
@@ -1,6 +1,7 @@
 import 'package:flutter/material.dart';
 
 import '../api/model/model.dart';
+import '../generated/l10n/zulip_localizations.dart';
 import '../model/narrow.dart';
 import '../model/recent_dm_conversations.dart';
 import '../model/unreads.dart';
@@ -218,7 +219,7 @@ abstract class _HeaderItem extends StatelessWidget {
     required this.sectionContext,
   });
 
-  String get title;
+  String title(ZulipLocalizations zulipLocalizations);
   IconData get icon;
   Color collapsedIconColor(BuildContext context);
   Color uncollapsedIconColor(BuildContext context);
@@ -238,6 +239,7 @@ abstract class _HeaderItem extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
+    final zulipLocalizations = ZulipLocalizations.of(context);
     final designVariables = DesignVariables.of(context);
     return Material(
       color: collapsed
@@ -272,7 +274,7 @@ abstract class _HeaderItem extends StatelessWidget {
               ).merge(weightVariableTextStyle(context, wght: 600)),
               maxLines: 1,
               overflow: TextOverflow.ellipsis,
-              title))),
+              title(zulipLocalizations)))),
           const SizedBox(width: 12),
           if (hasMention) const _IconMarker(icon: ZulipIcons.at_sign),
           Padding(padding: const EdgeInsetsDirectional.only(end: 16),
@@ -293,7 +295,8 @@ class _AllDmsHeaderItem extends _HeaderItem {
     required super.sectionContext,
   });
 
-  @override String get title => 'Direct messages'; // TODO(i18n)
+  @override String title(ZulipLocalizations zulipLocalizations) =>
+    zulipLocalizations.recentDmConversationsPageTitle;
   @override IconData get icon => ZulipIcons.user;
 
   // TODO(design) check if this is the right variable for these
@@ -362,16 +365,20 @@ class _DmItem extends StatelessWidget {
     final store = PerAccountStoreWidget.of(context);
     final selfUser = store.users[store.selfUserId]!;
 
+    final zulipLocalizations = ZulipLocalizations.of(context);
     final designVariables = DesignVariables.of(context);
 
     final title = switch (narrow.otherRecipientIds) { // TODO dedupe with [RecentDmConversationsItem]
       [] => selfUser.fullName,
-      [var otherUserId] => store.users[otherUserId]?.fullName ?? '(unknown user)',
+      [var otherUserId] =>
+        store.users[otherUserId]?.fullName ?? zulipLocalizations.unknownUserName,
 
       // TODO(i18n): List formatting, like you can do in JavaScript:
       //   new Intl.ListFormat('ja').format(['Chris', 'Greg', 'Alya', 'Shu'])
       //   // 'Chris、Greg、Alya、Shu'
-      _ => narrow.otherRecipientIds.map((id) => store.users[id]?.fullName ?? '(unknown user)').join(', '),
+      _ => narrow.otherRecipientIds.map(
+        (id) => store.users[id]?.fullName ?? zulipLocalizations.unknownUserName
+      ).join(', '),
     };
 
     return Material(
@@ -417,7 +424,8 @@ class _StreamHeaderItem extends _HeaderItem {
     required super.sectionContext,
   });
 
-  @override String get title => subscription.name;
+  @override String title(ZulipLocalizations zulipLocalizations) =>
+    subscription.name;
   @override IconData get icon => iconDataForStream(subscription);
   @override Color collapsedIconColor(context) =>
     colorSwatchFor(context, subscription).iconOnPlainBackground;
diff --git a/lib/widgets/message_list.dart b/lib/widgets/message_list.dart
index 8c32a12115..8bceca646a 100644
--- a/lib/widgets/message_list.dart
+++ b/lib/widgets/message_list.dart
@@ -317,6 +317,7 @@ class MessageListAppBarTitle extends StatelessWidget {
   Widget _buildStreamRow(BuildContext context, {
     ZulipStream? stream,
   }) {
+    final zulipLocalizations = ZulipLocalizations.of(context);
     // A null [Icon.icon] makes a blank space.
     final icon = stream != null ? iconDataForStream(stream) : null;
     return Row(
@@ -328,7 +329,8 @@ class MessageListAppBarTitle extends StatelessWidget {
       children: [
         Icon(size: 16, icon),
         const SizedBox(width: 4),
-        Flexible(child: Text(stream?.name ?? '(unknown channel)')),
+        Flexible(child: Text(
+          stream?.name ?? zulipLocalizations.unknownChannelName)),
       ]);
   }
 
@@ -420,9 +422,10 @@ class MessageListAppBarTitle extends StatelessWidget {
       case DmNarrow(:var otherRecipientIds):
         final store = PerAccountStoreWidget.of(context);
         if (otherRecipientIds.isEmpty) {
-          return const Text("DMs with yourself");
+          return Text(zulipLocalizations.messageListYouWithYourselfTitle);
         } else {
-          final names = otherRecipientIds.map((id) => store.users[id]?.fullName ?? '(unknown user)');
+          final names = otherRecipientIds.map(
+            (id) => store.users[id]?.fullName ?? zulipLocalizations.unknownUserName);
           return Text("DMs with ${names.join(", ")}"); // TODO show avatars
         }
     }
@@ -1027,6 +1030,7 @@ class StreamMessageRecipientHeader extends StatelessWidget {
     //   https://github.com/zulip/zulip-mobile/issues/5511
     final store = PerAccountStoreWidget.of(context);
     final designVariables = DesignVariables.of(context);
+    final zulipLocalizations = ZulipLocalizations.of(context);
 
     final topic = message.topic;
 
@@ -1051,7 +1055,7 @@ class StreamMessageRecipientHeader extends StatelessWidget {
       final stream = store.streams[message.streamId];
       final streamName = stream?.name
         ?? message.displayRecipient
-        ?? '(unknown channel)'; // TODO(log)
+        ?? zulipLocalizations.unknownChannelName; // TODO(log)
 
       streamWidget = GestureDetector(
         onTap: () => Navigator.push(context,
diff --git a/lib/widgets/profile.dart b/lib/widgets/profile.dart
index 57dd76a0ab..ce23dfa37f 100644
--- a/lib/widgets/profile.dart
+++ b/lib/widgets/profile.dart
@@ -121,17 +121,18 @@ class _ProfileErrorPage extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
+    final zulipLocalizations = ZulipLocalizations.of(context);
     return Scaffold(
-      appBar: ZulipAppBar(title: const Text('Error')),
-      body: const SingleChildScrollView(
+      appBar: ZulipAppBar(title: Text(zulipLocalizations.errorDialogTitle)),
+      body: SingleChildScrollView(
         child: Padding(
-          padding: EdgeInsets.symmetric(horizontal: 16, vertical: 32),
+          padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 32),
           child: Row(
             mainAxisAlignment: MainAxisAlignment.center,
             children: [
-              Icon(Icons.error),
-              SizedBox(width: 4),
-              Text('Could not show user profile.'),
+              const Icon(Icons.error),
+              const SizedBox(width: 4),
+              Text(zulipLocalizations.errorShowUserProfile),
             ]))));
   }
 }
@@ -290,8 +291,9 @@ class _UserWidget extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     final store = PerAccountStoreWidget.of(context);
+    final zulipLocalizations = ZulipLocalizations.of(context);
     final user = store.users[userId];
-    final fullName = user?.fullName ?? '(unknown user)';
+    final fullName = user?.fullName ?? zulipLocalizations.unknownUserName;
     return InkWell(
       onTap: () => Navigator.push(context,
         ProfilePage.buildRoute(context: context,
diff --git a/lib/widgets/recent_dm_conversations.dart b/lib/widgets/recent_dm_conversations.dart
index c9d3131591..ddc32861a3 100644
--- a/lib/widgets/recent_dm_conversations.dart
+++ b/lib/widgets/recent_dm_conversations.dart
@@ -1,5 +1,6 @@
 import 'package:flutter/material.dart';
 
+import '../generated/l10n/zulip_localizations.dart';
 import '../model/narrow.dart';
 import '../model/recent_dm_conversations.dart';
 import '../model/unreads.dart';
@@ -81,6 +82,7 @@ class RecentDmConversationsItem extends StatelessWidget {
     final store = PerAccountStoreWidget.of(context);
     final selfUser = store.users[store.selfUserId]!;
 
+    final zulipLocalizations = ZulipLocalizations.of(context);
     final designVariables = DesignVariables.of(context);
 
     final String title;
@@ -94,13 +96,15 @@ class RecentDmConversationsItem extends StatelessWidget {
         //   (should we offer a "spam folder" style summary screen of recent
         //   1:1 DM conversations from muted users?)
         final otherUser = store.users[otherUserId];
-        title = otherUser?.fullName ?? '(unknown user)';
+        title = otherUser?.fullName ?? zulipLocalizations.unknownUserName;
         avatar = AvatarImage(userId: otherUserId, size: _avatarSize);
       default:
         // TODO(i18n): List formatting, like you can do in JavaScript:
         //   new Intl.ListFormat('ja').format(['Chris', 'Greg', 'Alya'])
         //   // 'Chris、Greg、Alya'
-        title = narrow.otherRecipientIds.map((id) => store.users[id]?.fullName ?? '(unknown user)').join(', ');
+        title = narrow.otherRecipientIds.map(
+          (id) => store.users[id]?.fullName ?? zulipLocalizations.unknownUserName
+        ).join(', ');
         avatar = ColoredBox(color: designVariables.groupDmConversationIconBg,
           child: Center(
             child: Icon(color: designVariables.groupDmConversationIcon,
diff --git a/lib/widgets/subscription_list.dart b/lib/widgets/subscription_list.dart
index d2faf03b2c..05af0387ea 100644
--- a/lib/widgets/subscription_list.dart
+++ b/lib/widgets/subscription_list.dart
@@ -1,6 +1,7 @@
 import 'package:flutter/material.dart';
 
 import '../api/model/model.dart';
+import '../generated/l10n/zulip_localizations.dart';
 import '../model/narrow.dart';
 import '../model/unreads.dart';
 import 'icons.dart';
@@ -65,10 +66,8 @@ class _SubscriptionListPageBodyState extends State<SubscriptionListPageBody> wit
 
     // TODO: Implement collapsible topics
 
-    // TODO(i18n): localize strings on page
-    //   Strings here left unlocalized as they likely will not
-    //   exist in the settled design.
     final store = PerAccountStoreWidget.of(context);
+    final zulipLocalizations = ZulipLocalizations.of(context);
 
     final List<Subscription> pinned = [];
     final List<Subscription> unpinned = [];
@@ -90,11 +89,11 @@ class _SubscriptionListPageBodyState extends State<SubscriptionListPageBody> wit
           if (pinned.isEmpty && unpinned.isEmpty)
             const _NoSubscriptionsItem(),
           if (pinned.isNotEmpty) ...[
-            const _SubscriptionListHeader(label: "Pinned"),
+            _SubscriptionListHeader(label: zulipLocalizations.pinnedSubscriptionsLabel),
             _SubscriptionList(unreadsModel: unreadsModel, subscriptions: pinned),
           ],
           if (unpinned.isNotEmpty) ...[
-            const _SubscriptionListHeader(label: "Unpinned"),
+            _SubscriptionListHeader(label: zulipLocalizations.unpinnedSubscriptionsLabel),
             _SubscriptionList(unreadsModel: unreadsModel, subscriptions: unpinned),
           ],
 
@@ -112,11 +111,12 @@ class _NoSubscriptionsItem extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     final designVariables = DesignVariables.of(context);
+    final zulipLocalizations = ZulipLocalizations.of(context);
 
     return SliverToBoxAdapter(
       child: Padding(
         padding: const EdgeInsets.all(10),
-        child: Text("No channels found",
+        child: Text(zulipLocalizations.noSubscriptions,
           textAlign: TextAlign.center,
           style: TextStyle(
             color: designVariables.subscriptionListHeaderText,