Adds missing translations.

Author: philipbrito

app/src/main/res/values-ar/strings.xml

@@ -60,6 +60,8 @@
     <string name="action_register">تسجيل</string>
     <string name="action_confirm">تأكيد</string>
     <string name="action_delete_account">حذف حساب</string>
+    <string name="action_favorite">Favorite</string> <!-- TODO Translate -->
+    <string name="action_remove_favorite">Remove favorite</string> <!-- TODO Translate -->
 
     <!-- Settings List -->
     <string-array name="settings_actions">
@@ -95,6 +97,8 @@
     <string name="msg_yesterday">أمس</string>
     <string name="msg_today">اليوم</string>
     <string name="msg_message">رسالة</string>
+    <string name="msg_video_call">Video call</string> <!-- TODO Translate -->
+    <string name="msg_join_video_call">Join video call</string> <!-- TODO Translate -->
     <string name="msg_this_room_is_read_only">هذه الغرفة للقراءة فقك</string>
     <string name="msg_invalid_2fa_code">Invalid 2FA Code</string>
     <string name="msg_invalid_file">ملف غير صالح</string>
@@ -177,6 +181,7 @@
         <item quantity="few">%1$s reacted with %2$s</item>
         <item quantity="two">%1$s reacted with %2$s</item>
     </plurals>
+    <string name="msg_credentials_saved_successfully">Credentials saved successfully</string> <!-- TODO Translate -->
 
     <!-- Create channel messages -->
     <string name="msg_private_channel">خاص</string>