Problem changing languages

Hello to all !

I have just installed a new filerun installation. Everything works fine, but when i try to change language to 'French', it doesn't work. I followed advices from other posts like deleting '\system\data\languages' and reupload it from the original installation zip, but it doesn't work. I also tried to make another one fresh and new installation of Filerun but the same problem occured. I tried to upload the file 'french.txt' from filerun dashboard and it remains same. I have tried to select other languages and it seems to be the same also.

Maybe i forgot to do something... Do you have any ideas ?

Thanks in advance for your help !