Remove no longer used warning from translations

Author: greenberga

locales/en/translation.json

@@ -51,7 +51,6 @@
   },
   "workspace": {
     "confirmations": {
-      "unload-unsaved": "If you leave the page, you will lose your work. To save your work, you must log in using your GitHub account.",
       "anonymous-gist-export": "Are you sure you want to export this gist anonymously? If you sign in before exporting, the gist will be added to your GitHub account."
     },
     "loading": "Loading…",