MM-11576: Allow to join and add members to archived channels (#9214)

i18n/en.json

@@ -91,10 +91,6 @@
     "id": "api.channel.add_user.to.channel.failed.deleted.app_error",
     "translation": "Failed to add user to channel because they have been removed from the team."
   },
-  {
-    "id": "api.channel.add_user_to_channel.deleted.app_error",
-    "translation": "The channel has been archived or deleted"
-  },
   {
     "id": "api.channel.add_user_to_channel.type.app_error",
     "translation": "Can not add user to this channel type"
@@ -163,10 +159,6 @@
     "id": "api.channel.delete_channel.type.invalid",
     "translation": "Cannot delete direct or group message channels"
   },
-  {
-    "id": "api.channel.join_channel.already_deleted.app_error",
-    "translation": "Channel is already deleted"
-  },
   {
     "id": "api.channel.join_channel.permissions.app_error",
     "translation": "You do not have the appropriate permissions"