fix(DescriptionAccountcreated): Mention that combining floccus with browser sync doesn't work

Signed-off-by: Marcel Klehr <[email protected]>

Author: marcelklehr

_locales/en/messages.json

@@ -700,7 +700,7 @@
     "message": "Profile created"
   },
   "DescriptionAccountcreated": {
-    "message": "Your profile has been created. You can close this tab now. One more thing: Sync is not a backup. Make sure you have regular backups of your bookmarks."
+    "message": "One more thing: Sync is not a backup. Make sure you have regular backups of your bookmarks.\n\nAlso note that combining floccus with the browser-built-in bookmark sync is not supported and you can end up with duplicates."
   },
   "DescriptionNonhttps": {
     "message": "You have entered a server that uses an insecure protocol. It is recommended to only use servers with support for HTTPS."