I don't know if this topic should be here but, I want to ask, How can I apply for translation campaign without any portfolio? or How can I get portfolios? thanks. 
You must try to apply for translation campaign that doesn't require portfolio. But there is very rare campaign like that, almost no.
If you have translation experiences in real life, other projects, non crypto related, it's also good and you can add them to your portfolio.
Good luck!