Option to change gender

[Leaced]

It's currently not possible to change the gender that was used for registration.

Maybe for cis people the own gender is something static, but trans people have a long transitioning with insecurities and sometimes it is necessary to try something. Especially when there are only 3 options and people have to decide with this limited possibilities, it is necessary to make this mutable.

Making it possible to change the name could also be helpful.