Unified translation classes, fixed missing toaster translation and improved the error styling report.

backend/locales/en-US.json

@@ -56,7 +56,7 @@
         "decky_title": "Decky",
         "decky_update_available": "Update to {{tag_name}} available!",
         "error": "Error",
-        "plugin_error_uninstall": "Please go to <0></0> in the Decky menu if you need to uninstall this plugin.",
+        "plugin_error_uninstall": "Loading {{name}} has caused an exception as shown above. This usually means that the plugin requires an update for the new version of SteamUI. Check if an update is present or evaluate his removal in <0></0> Settings <1></1> <2></2> Plugins.",
         "plugin_load_error": {
             "message": "Error loading plugin {{name}}",
             "toast": "Error loading {{name}}"