diff --git a/backend/modules/content/views/article/_form.php b/backend/modules/content/views/article/_form.php
index 665fab2ed..3eb1f38fc 100644
--- a/backend/modules/content/views/article/_form.php
+++ b/backend/modules/content/views/article/_form.php
@@ -21,7 +21,7 @@
 <?php echo $form->field($model, 'title')->textInput(['maxlength' => true]) ?>
 
 <?php echo $form->field($model, 'slug')
-    ->hint(Yii::t('backend', 'If you\'ll leave this field empty, slug will be generated automatically'))
+    ->hint(Yii::t('backend', 'If you leave this field empty, the slug will be generated automatically'))
     ->textInput(['maxlength' => true]) ?>
 
 <?php echo $form->field($model, 'category_id')->dropDownList(\yii\helpers\ArrayHelper::map(
diff --git a/backend/modules/content/views/category/_form.php b/backend/modules/content/views/category/_form.php
index 82151c360..fbd3e5f5e 100644
--- a/backend/modules/content/views/category/_form.php
+++ b/backend/modules/content/views/category/_form.php
@@ -19,7 +19,7 @@
 <?php echo $form->field($model, 'title')->textInput(['maxlength' => 512]) ?>
 
 <?php echo $form->field($model, 'slug')
-    ->hint(Yii::t('backend', 'If you\'ll leave this field empty, slug will be generated automatically'))
+    ->hint(Yii::t('backend', 'If you leave this field empty, the slug will be generated automatically'))
     ->textInput(['maxlength' => 1024]) ?>
 
 <?php echo $form->field($model, 'parent_id')->dropDownList($categories, ['prompt' => '']) ?>
diff --git a/common/messages/es/backend.php b/common/messages/es/backend.php
index fc1b003ad..351ac3220 100644
--- a/common/messages/es/backend.php
+++ b/common/messages/es/backend.php
@@ -72,7 +72,7 @@
     'I18n Messages' => 'Textos I18N',
     'I18n Source Messages' => 'Textos Originales I18N',
     'ID' => 'ID',
-    'If you\'ll leave this field empty, slug will be generated automatically' => 'Si dejas este campo vacío, el slug se generará de forma automática',
+    'If you leave this field empty, the slug will be generated automatically' => 'Si dejas este campo vacío, el slug se generará de forma automática',
     'Incorrect username or password.' => 'Nombre usuario o contraseña incorrecto',
     'Internal IP' => 'IP interna',
     'Invalidate tag' => 'Etiqueta no válida',
diff --git a/common/messages/pl/backend.php b/common/messages/pl/backend.php
index ce1bc2658..83e96e050 100644
--- a/common/messages/pl/backend.php
+++ b/common/messages/pl/backend.php
@@ -69,7 +69,7 @@
     'I18n Messages' => 'I18n Tłumaczenia',
     'I18n Source Messages' => 'I18n Teksty',
     'ID' => 'ID',
-    'If you\'ll leave this field empty, slug will be generated automatically' => 'Jeżeli zostawisz te pole puste slug zostanie utworzony automatycznie',
+    'If you leave this field empty, the slug will be generated automatically' => 'Jeżeli zostawisz te pole puste slug zostanie utworzony automatycznie',
     'Incorrect username or password.' => 'Nieprawidłowa nazwa użytkownika lub hasło',
     'Internal IP' => 'Wewnętrzne IP',
     'Invalidate tag' => 'Unieważnij tag',
diff --git a/common/messages/pt-BR/backend.php b/common/messages/pt-BR/backend.php
index 00511751e..355402d97 100644
--- a/common/messages/pt-BR/backend.php
+++ b/common/messages/pt-BR/backend.php
@@ -72,7 +72,7 @@
     'I18n Messages' => 'Mensagens I18N',
     'I18n Source Messages' => 'Fonte de Mensagens I18N',
     'ID' => 'ID',
-    'If you\'ll leave this field empty, slug will be generated automatically' => 'Se deixar esse campo vazio, slug será gerado automaticamente',
+    'If you leave this field empty, the slug will be generated automatically' => 'Se deixar esse campo vazio, slug será gerado automaticamente',
     'Incorrect username or password.' => 'Usuário ou senha incorreto',
     'Internal IP' => 'IP interno',
     'Invalidate tag' => 'Etiqueta inválida',
diff --git a/common/messages/ru/backend.php b/common/messages/ru/backend.php
index 793b52a00..19b45be26 100644
--- a/common/messages/ru/backend.php
+++ b/common/messages/ru/backend.php
@@ -69,7 +69,7 @@
     'I18n Messages' => 'I18N переводы',
     'I18n Source Messages' => 'Тексты',
     'ID' => 'ID',
-    'If you\'ll leave this field empty, slug will be generated automatically' => 'Если вы оставите это поле пустым, ЧПУ будет сгенерирован автоматически',
+    'If you leave this field empty, the slug will be generated automatically' => 'Если вы оставите это поле пустым, ЧПУ будет сгенерирован автоматически',
     'Incorrect username or password.' => 'Неправильный логин или пароль',
     'Internal IP' => 'Внутренний IP',
     'Invalidate tag' => 'Сбросить тег',
diff --git a/common/messages/uk/backend.php b/common/messages/uk/backend.php
index 703d658ef..6e310eb3e 100644
--- a/common/messages/uk/backend.php
+++ b/common/messages/uk/backend.php
@@ -69,7 +69,7 @@
     'I18n Messages' => 'I18N переклади',
     'I18n Source Messages' => 'Тексти',
     'ID' => 'ID',
-    'If you\'ll leave this field empty, slug will be generated automatically' => 'Якщо ви залишете це поле пустим, ЧПУ буде сгенеровано автоматично',
+    'If you leave this field empty, the slug will be generated automatically' => 'Якщо ви залишете це поле пустим, ЧПУ буде сгенеровано автоматично',
     'Incorrect username or password.' => 'Неправильні им’я користувача або пароль',
     'Internal IP' => 'Внутрішній IP',
     'Invalidate tag' => 'Скинути тег',
diff --git a/common/messages/vi/backend.php b/common/messages/vi/backend.php
index 2852e3b02..aa63757d7 100644
--- a/common/messages/vi/backend.php
+++ b/common/messages/vi/backend.php
@@ -72,7 +72,7 @@
     'I18n Messages' => 'I18N Messages',
     'I18n Source Messages' => 'I18n Source Messages',
     'ID' => 'ID',
-    'If you\'ll leave this field empty, slug will be generated automatically' => 'Nếu bạn để trống, slug sẽ được tạo tự động',
+    'If you leave this field empty, the slug will be generated automatically' => 'Nếu bạn để trống, slug sẽ được tạo tự động',
     'Incorrect username or password.' => 'Sai tên đăng nhập hoặc mật khẩu',
     'Internal IP' => 'Internal IP',
     'Invalidate tag' => 'Invalidate tag',
diff --git a/common/messages/zh/backend.php b/common/messages/zh/backend.php
index 96f2e38cb..8ee94a60b 100644
--- a/common/messages/zh/backend.php
+++ b/common/messages/zh/backend.php
@@ -72,7 +72,7 @@
     'I18n Messages' => '国际化信息',
     'I18n Source Messages' => '国际化源信息',
     'ID' => 'ID',
-    'If you\'ll leave this field empty, slug will be generated automatically' => '如果该字段留空的话，系统将自动生成一个slug',
+    'If you leave this field empty, the slug will be generated automatically' => '如果该字段留空的话，系统将自动生成一个slug',
     'Incorrect username or password.' => '用户名或密码错误',
     'Internal IP' => '内网IP',
     'Invalidate tag' => '无效的标签',
diff --git a/frontend/controllers/SiteController.php b/frontend/controllers/SiteController.php
index a3fc28e66..93f736bb7 100755
--- a/frontend/controllers/SiteController.php
+++ b/frontend/controllers/SiteController.php
@@ -3,8 +3,6 @@
 namespace frontend\controllers;
 
 use cheatsheet\Time;
-use common\sitemap\ArticleUrlGenerator;
-use common\sitemap\PageUrlGenerator;
 use common\sitemap\UrlsIterator;
 use frontend\models\ContactForm;
 use Sitemaped\Element\Urlset\Urlset;
@@ -75,12 +73,12 @@ public function actionContact()
                     'options' => ['class' => 'alert-success']
                 ]);
                 return $this->refresh();
-            } else {
-                Yii::$app->getSession()->setFlash('alert', [
-                    'body' => \Yii::t('frontend', 'There was an error sending email.'),
-                    'options' => ['class' => 'alert-danger']
-                ]);
             }
+
+            Yii::$app->getSession()->setFlash('alert', [
+                'body' => \Yii::t('frontend', 'There was an error sending email.'),
+                'options' => ['class' => 'alert-danger']
+            ]);
         }
 
         return $this->render('contact', [
@@ -92,6 +90,7 @@ public function actionContact()
      * @param string $format
      * @param bool $gzip
      * @return string
+     * @throws BadRequestHttpException
      */
     public function actionSitemap($format = Sitemap::FORMAT_XML, $gzip = false)
     {