I have seen Translation Campaigns that requires you to put your previous works/translations. Is there any chance for a beginner, who doesn't have translations yet, to join this kind of campaigns? If yes, how? Thanks!
Just offer a free translation to any ICO so that you can have your own sample and you can start making your portfolio so that in the future you will don't have any problem when you want to join.
Well, that's a good starting point make a service for free. Or if you don't mind just try to work on something even they don't ask for. Its hard to join on that campaign if you don't have any experience but some managers are still accepting it though its very rare to find.