From Gentoo Wiki
Welcome to the translation team!
this is a quick notice for you that your translator account has been enabled.
If you were the first translator for your language, please start by properly translating the Help:Translating article into your language using the translation tools.
Should you wish to translate into other languages as well in the future, please add yourself again to the translator account request page.
—a3li 09:15, 11 May 2014 (UTC)
pages are not translatable right away. It is only available on pages that have a certain amount of content. So your tests on the Sandbox or your User page won't work. Try one of the pages linked here. If you have any more questions, find me in #gentoo-wiki on IRC.
—a3li 09:31, 11 May 2014 (UTC)