If you see that a manual for your language is set up, and you would like to join the group, please ask on the mailing list about who is reponsible to manage that translation.
If you are new to the PHP project, and you have no CVS account, you need to request one account, before you can join the work. Although there are some translations where just a few people have CVS accounts, and they are responsible for comitting the other's works, this may not be ideal.