PLT-1384 Added websocket event when preferences are updated/deleted (#6107)

i18n/en.json

@@ -1687,10 +1687,6 @@
     "id": "api.preference.save_preferences.set.app_error",
     "translation": "Unable to set preferences for other user"
   },
-  {
-    "id": "api.preference.save_preferences.set_details.app_error",
-    "translation": "session.user_id={{.SessionUserId}}, preference.user_id={{.PreferenceUserId}}"
-  },
   {
     "id": "api.reaction.delete_reaction.mismatched_channel_id.app_error",
     "translation": "Failed to delete reaction because channel ID does not match post ID in the URL"