Booking form translation

Hi there,

I'm looking for some help to find the right language file at Joomla to translate the fields at restaurant reservations form.
Also, I appreciate if somebody let me know where can I choose an email to receive the copy of the submissions for the contact us form .

Thank you in advance

Hi,
you have to translate:
administrator\language\en-GB\en-GB.plg_system_gkreservation.ini