Hi,
You can use WPML, POEdit, Loco Translate ect. There are many available.
To use POEdit and translate to an example language like French:
You will need to translate those strings or un-check the fuzzy translations. Please do this:
1) Download POEdit https://poedit.net/
2) Download your language file from your ftp atelier/languages/fr_FR.po
3) Search through your strings and amend the translations. Save as your.
4) When finished, click File => Compile to MO.
5) Upload your new language files BOTH fr_FR.po
and fr_FR.po
to the folder atelier/languages/
Thanks.