Add human-readable name & summary to Flatpak manifest

https://phabricator.endlessm.com/T35013

hooks/image/70-flatpak-manifest

@@ -49,7 +49,7 @@ def get_data_for_ref(
     date = commit_date_string(repo, commit)
     version = installed_ref.get_appdata_version()
 
-    return key, {
+    data = {
         'name': name,
         'arch': arch,
         'branch': branch,
@@ -61,6 +61,23 @@ def get_data_for_ref(
         'version': version,
     }
 
+    # TODO: It would be nice to consider EIB_FLATPAK_LOCALES and extract the
+    # name and summary in those locales too. Unfortunately while there is
+    # internal API to do this easily, it is not exposed by libflatpak.
+    #
+    # TODO: these function calls get the name in the current locale. We assume
+    # this is the C locale but it probably isn't.
+    appdata_name = installed_ref.get_appdata_name()
+    appdata_summary = installed_ref.get_appdata_summary()
+    if appdata_name or appdata_summary:
+        data['appdata'] = {'C': {}}
+        if appdata_name:
+            data['appdata']['C']['name'] = appdata_name
+        if appdata_summary:
+            data['appdata']['C']['summary'] = appdata_summary
+
+    return key, data
+
 
 def main():
     # Build the json data structure