...
In emakin designed process language is not important, you can use any language to design. After design is completed or an change is applied you can open the localization editor from process designer.
After a localization editor is opened you can add any other languages with "Add New" button to localize process.
Each added language have a 2 letter identifier of that language. List of language identifiers can be found at List of ISO 639-1 codes
After a language is added, you can click "Details" button to edit localization texts. Emakin will scan your processes and list of texts to localize. Non localized texts will be marked as red if they're mandatory, if not original string will be used.
After localization is completed, depending on active user language preference process will be displayed and run in localized language.
...