How to Translate Modules from backoffice?
Go to back end of your prestashop and login, then:
Here I will show you how to translate the top right corner module called blockuserinfo.
STEP 1: Localization > Translations > Under Modify translations select Installed modules > then click on your COUNTRY/LANGUAGE flag.
STEP 2: scroll down to blockuserinfo, there u will find “My bag” & “Your shopping cart” Hit update translation on top right and check. If you see no change then try next step. Go to Advanced Parameters > Performance and select Force compilation and save and also make sure cache is disabled.
If you get an error saving, there should be issue with right permissions on your server. So follow the next step:
Go to /themes/cotton/modules/blockuserinfo/ give 777 permission to example fr.php, Command: chmod 777 fr.php
Go back and try to save again.
Similars steps can be applied for:
blocklanguagestop (which is for top left module for language selection)
blockcurrenciestop (which is for top left module for currency selection)
blockcontactinfos (which is for bottom right module for contact info)