Language file does not update

Hi,

I translated the language file and put it to the wp-content/languages. Then I set this lang in wp-config.php file. However, now, if I want to make some update of this file, the change does not apply. The process is like this:

Download lang file I used before -> make the changes -> upload it back to the ftp to lang dir. However, no changes apply to the language on the web.

What I am doing wrong, please?

Thank you! 🙂

Kind regards,
n