Changing nick does not change the slug

[bcanata]

Changing the nickname of a user does not change the slug of the user (e.g. https://sozluk.me/author/xxx/).

[realsuayip]

although admins can forcibly do it, changing nicks are not allowed on the platform.

since this was the historically accepted that way, parts of the code might not work if this feature is introduced. if a lot of people request it, i might do some research

[realsuayip]

now fixed in 1.6.0