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!
Well you need to start in some point, with time you will collect your portfolio and you will be able to participate in the transalation bounties easily. Start offering your job and translating ANN and whitepapers even for free just to create your portfolio which is required by bounty managers.