MM-11270: Forbid react/de-react in archived channels (#9323)

i18n/en.json

@@ -1434,6 +1434,14 @@
     "id": "api.preference.update_preferences.set.app_error",
     "translation": "Unable to set user preferences."
   },
+  {
+    "id": "api.reaction.delete.archived_channel.app_error",
+    "translation": "You cannot remove a reaction in an archived channel."
+  },
+  {
+    "id": "api.reaction.save.archived_channel.app_error",
+    "translation": "You cannot react in an archived channel."
+  },
   {
     "id": "api.reaction.save_reaction.invalid.app_error",
     "translation": "Reaction is not valid."