For simplify the internationalization of forum you can use instead of gmdate the php function gmstrftime

return gmstrftime($this->time_options[$method], ($date + $this->offset) );

instead of

return gmdate($this->time_options[$method], ($date + $this->offset) );

with the function setlocale() before (argoument of setlocale editable directly by admin cp)


now all date is writed in all language possible

This functionality is in great demand by IPB's users non-english (with ACP per language pack)

Apparently, that will be added in the next version (see : Bug ID #423: Localized date)