add stock strings for new instant-group-join

deltachat-ios/AppDelegate.swift

@@ -592,6 +592,8 @@ class AppDelegate: UIResponder, UIApplicationDelegate, UNUserNotificationCenterD
         dcContext.setStockTranslation(id: DC_STR_MESSAGES, localizationKey: "messages")
         dcContext.setStockTranslation(id: DC_STR_BROADCAST_LIST, localizationKey: "broadcast_list")
         dcContext.setStockTranslation(id: DC_STR_PART_OF_TOTAL_USED, localizationKey: "part_of_total_used")
+        dcContext.setStockTranslation(id: DC_STR_SECURE_JOIN_STARTED, localizationKey: "secure_join_started")
+        dcContext.setStockTranslation(id: DC_STR_SECURE_JOIN_REPLIES, localizationKey: "secure_join_replies")
     }
 
     func appIsInForeground() -> Bool {