Update quotes and mentions when username is changed

[chrispanag (Christos Panagiotakopoulos)]

I’m bumping this topic especially for this case:

@sam

I always wanted our users routes to be /users/ID/etc this would be a non issue

@sam

In practice renaming users is really super rare, but there is something to be said about the extra flexibility you get with ids, especially if we ever allow Chinese usernames etc.

Firstly, you now allow UTF-8 usernames… so…

Also, this issue was discovered: Unicode username with Σ as the final char leads to an error loading profile page

Long story short, there are inconsistencies between Javascript’s, Ruby’s and Postgresql’s handling of various UTF-8 characters. (eg: in uppercasing-lowercasing). I think the aforementioned issue could make UTF-8 characters unsafe in usernames if another routing method, involving the user id is not implemented.

So, it’s a chance to revisit this decision