Where can I translate it?

That string is in the mod_sclogin.ini language file. If you have troubles finding that or need more help, just let us know.

Thanks,
Alex

No problem, glad we could help! If you need anything else, just let us know.

Finally, if you havent already, please consider leaving a rating and review on the Joomla Extension Directory for JFBConnect and/or our support. It's certainly not required, but very appreciated:
extensions.joomla.org/extensions/social-...ook-integration/7215

Thanks, and good luck,
Alex