i18n: live reload error

_locales/en/messages.json

@@ -498,6 +498,10 @@
     "message": "Live reload",
     "description": "The label of live-reload feature"
   },
+  "liveReloadError": {
+    "message": "An error occurred while watching the file",
+    "description": "The label of live-reload error"
+  },
   "manageFilters": {
     "message": "Filters",
     "description": "Label for filters container"

content/install-user-css.js

@@ -46,7 +46,9 @@ function createSourceLoader() {
             return cb(source);
           }
         })
-        .catch(console.log)
+        .catch(error => {
+          console.log(t('liveReloadError', error));
+        })
         .then(() => {
           timer = setTimeout(check, DELAY);
         });