Fix channels showing up across teams when multiple teams open in same browser (#3329)

i18n/en.json

@@ -203,6 +203,10 @@
     "id": "api.channel.delete_channel.permissions.app_error",
     "translation": "You do not have the appropriate permissions"
   },
+  {
+    "id": "api.channel.get_channel.wrong_team.app_error",
+    "translation": "There is no channel with channel_id={{.ChannelId}} on team with team_id={{.TeamId}}"
+  },
   {
     "id": "api.channel.get_channel_counts.app_error",
     "translation": "Unable to get channel counts from the database"