Please follow these steps to translate a theme to your language.
Change the language in the admin settings screen. Settings > General > Site Language
Download and install poedit.
Look for default.po file in your theme’s root directory, If it is not there then look for it in the ‘languages’. directory.
Start translating fr_FR.po in poedit software from English to French. You do not need to translate everything, instead look for the sentences or words that you really need to translate and leave the others as it is.
Save the fr_FR.po file in poedit and it will create a new file named fr_FR.mo with in the same directory as fr_FR.po file in your computer.
Upload fr_FR.po & fr_FR.mo to the directory from where you have downloaded the default.po in start.
That’s it. Your translation should work fine now.
If you have any problem or question with translation. Please let us know by submitting a support ticket.
Thanks & Regards