feat: improve rich chat notifications

- show image previews in photo notifications

- localize non-text notification bodies by message type

- use sender names as notification titles

android/app/src/main/res/values-ru/strings.xml

@@ -83,6 +83,15 @@
     <string name="notification_action_reply">Ответить</string>
     <string name="notification_action_reply_hint">Введите ответ</string>
     <string name="notification_action_mark_read">Прочитано</string>
+    <string name="notification_messages_count">%1$d сообщений</string>
+    <string name="notification_summary_count">%1$d новых сообщений в %2$d чатах</string>
+    <string name="notification_type_message">Сообщение</string>
+    <string name="notification_type_photo">Фото</string>
+    <string name="notification_type_video">Видео</string>
+    <string name="notification_type_audio">Аудио</string>
+    <string name="notification_type_voice">Голосовое</string>
+    <string name="notification_type_circle">Кружок</string>
+    <string name="notification_type_file">Файл</string>
     <string name="profile_avatar_content_description">Аватар</string>
     <string name="profile_user_fallback">Пользователь</string>
     <string name="profile_choose_photo">Выбрать фото</string>