1. Translator emails are usually inside the translation file, but I like the idea of adding the translator's name to the about page. I'll talk with the other developers about it.
2. First of all, I recommend you to check the
translation statistics page every 2 weeks, so you can translate everything in little chunks and don't have hundreds of strings shortly before the release.
But in any case, before we make a release, we notifiy translators by Email about it and try to do it in a timely manner. Either write your Email address in the po-file or tell me which address to use.