Hi @cedrusvn,
There are two questions in you post, if I understand correctly:
- How to translate OJS (adding a new language): see the instructions https://pkp.sfu.ca/wiki/index.php?title=Translating_OxS
- How to have name and family name in two languages: not all the attributes/fields are implemented in a way to support multiple languages. Name and family are not, please see more: Translation of the author's name
Regards, Primož