In the past, being active in translations meant that you needed either commit access to the repository in which Gentoo's documentation was hosted, or you needed to be part of a team that worked together on translations where a number of people are also developers in Gentoo with commit access, regularly synchronizing the translations from the team with the Gentoo repository.
With the Gentoo Wiki now being actively used for documentation development and translations, this is no longer the case. Anyone interested in supporting translations on the Gentoo Wiki can work with the Translating instructions to support translations.
On the Gentoo Wiki, anybody can help us with the translation of pages and articles. All you need is to have an active account on the Gentoo Wiki, and follow the instructions for translations.
Gentoo Handbook translations
In late 2014, the Gentoo Handbook has also been moved to the Gentoo Wiki. The process for translating handbook pages does not differ from the process for translating other Wiki articles. Please refer to Gentoo handbook development for more information on the structure of the handbook.
Moving old translations to the Gentoo Wiki
When the documentation moved to the Gentoo Wiki, its translations (including the handbook's) couldn't easily be migrated. The old translated articles are still reachable on www.gentoo.org, though. For instance, the German translation of the Gentoo handbook can be reached via http://www.gentoo.org/doc/de/handbook/.
In order to avoid duplicate effort, the old translated contents can be copy-pasted over onto the Gentoo Wiki instead of translating the pages all over again. Keep in mind, however, that the articles have evolved and have been improved by a larger set of editors on the Gentoo Wiki now, so the old translations most likely do not entirely match the Wiki pages' current contents anymore and need to be merged accordingly. Using them as a base is still better than translating from scratch, though.