If you see that a manual for your language is set up, and you would like to join the group, please ask on the appropriate mailing list about who is responsible for managing that translation.
If you are new to the PHP project, and you have no CVS account, please introduce yourself to the existing translation team and send in patches of your translations, so that they get to know you, and can endorse you later, when you request a CVS account to more seriously work on the translation. Note that there are some translations where just a few people have CVS accounts, and they are responsible for committing other's works.