I apologize that it has taken so long to respond. Its been a busy week :/
Thanks for reporting this. And reporting it in such detail. It looks like this issue began in version 7.6.0.
I have made several corrections to fix it for version 7.7.5.
OLD:
$ubbt_lang['USER_ADMIN'] = "Administrator";
$ubbt_lang['USER_GMOD'] = "Global Moderator";
$ubbt_lang['USER_MOD'] = "Moderated by"; <- incorrect language value
CHANGED:
$ubbt_lang['USER_ADMIN'] = "Administrator";
$ubbt_lang['USER_GMOD'] = "Global Moderator";
$ubbt_lang['USER_MOD'] = "Moderator"; <-- fixed language value
$ubbt_lang['MODDED_BY'] = "Moderated by"; <-- created language string
• The templates which were using the old language value are now using this string.
• The scripts which were using the incorrect language value will now display the expected language value.