Use .mo/.po files and Poedit software
Translation files included into theme within Language Folder we recommend to use .mo/.po files. Those files works in pair so for each language you need to have 2 files with the same name but with different extension. For example if you want to translate theme into German language, you’re files should be de_DE.mo and de_DE.po
For editing the PO file you need to use Poedit software . All you need to do is copy the existing .PO File , Rename it as your locale edit the new PO. File with the software , after finish translation please save and upload the new .mo/.po files into “languages” folder where theme is installed.
Multilingual website using WPML integration
If your purchased WPML Plugin for Multilangual website , Zad is compatible and ready for WPML Plugin
For more information about WPML please visit WPML Documentation