What service combines translation with the largest number of users and language coverage?

Himself quite often use notabenoid.com. I do not presume to say that this is the major project for collaborative translation, but quite popular (see www.alexa.com/siteinfo/notabenoid.com). Potentially language coverage there is a big — there is a technical possibility of adding phrases in almost any language of the world, but in reality everything revolves around the major languages. Although there are texts and Malagasy, for example.

Very popular translated.by/

Also interested in this question, but all links above are dead.
Found a similar question on the network, I'll leave links here and here , and I want to look at pootle.