It's been a while I wanted to improve the registration process of #diaspora to make it clearer. With information like, your username can't be changed, your e-mail won't be shared, here is the pod on which you are registering. No need to register again if you have an account on another pod. And a link to the tutorials, to help.
I did all of this in https://github.com/diaspora/diaspora/pull/8285 and now that the review is done, this work is merged in the develop branch of diaspora*!
So, I will immediately deploy it on #diaspora-fr. Here is some screen shots of before / after.