h found this at a forum so you can try something like this in a plug in
{{$lang = \IPS\Member::loggedIn()->language()->short;}}
{{if mb_strpos($lang, 'ru_RU') === 0}}
some html
{{elseif mb_strpos($lang, 'fr_FR') === 0}}
some FR html
... additional 10+ languages
{{else}}
EN content
{{endif}}