Translation

Hello,

I’m looking for doing a correct translation of all buttons and titles according the choosen language for my website.
I use polylang.
Before the major update of Side Cart, I managed, more or less, translating the buttons with registring string with polylang, but with the update, I lost almost everything.
So I would like making this with the right procedure… I guess with a po and mo files.
Could someone help me to start on the right direction to do that ?
Thanks a lot in advance.
Best regards
Bertrand

The page I need help with: [log in to see the link]