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!
I am pleased to see someone acually thinking about translation bounties.
I had the same problem aswell. What I did is I dug up a translation from around 2 years ago, and linked it as a proof of my knowledge.
They accepted it.
Although, of my experience, most of the companies actually need previous works, whitepapers of ANN threads. So you will have to find a company, which is not so strict about the translations.
For me, it was the 4th I applied for. With that translation done, I see it was the barrier to entry any translation campaign where my language qualifies.