I'm trying to get my head round how this works.

I have a custom template (atcontact.tpl & atcontact.inc.php) so in the Language file online.php I have added: Key: atcontact | String: Viewing the contact page so it appears on the Who's Online page.

Q: If I overwrite the language files when a UBB update is released, will I have to re-enter the atcontact line?

If this is the case, does this happen to any additional "language files" for standard templates? e.g. if I incorporated a FRENCH language file and updated the UBB would it all revert back to English?