Nope. Your email can be used ONLY in two ways: 1) account password reset 2) Lukas (@lnowaczek) contacting you directly to ask if you want to be an admin of a language you contributed to.
Shoot an email at firstname.lastname@example.org or ping @lnowaczek on Twitter.
After you add a translation, it must be approved by an admin. Each language have separate admins. If given language have no admins, we will contact most active people and invite them to be an admin for given language.
It can happen. If you think you found an old/unused string, please report it to email@example.com
We know that some things can't be translated to other languages because of grammar issues. If you'll encounter such issue, send an email describing it to firstname.lastname@example.org.