Application language

Hello Aronium,
i wanted to integrate Frensh in my Aronium, i found a user here who shared a "fr.lang" file, i downloaded it and paste it in "Lang" folder in my Aronium... when i start my Software everything works fine, but when i want to check and get a receipt, the software shuts down ! i'm wondering if i did something wrong with installing the language extension, otherwise if you have any supported French file please refer me a link so i can download it ! thank you so much
looking forward for your answer !