In comments: @-mentions are not linked when real name contains non a-z characters

First of all; sorry if this is a duplicate of an already existing issue – I tried searching the issue tracker but couldn't find anything similar.

When using @ mentions (like @mannew to link to my profile), Bitbucket fails to link to the user profile when the user's "real name" contains non a-z characters (like in Swedish the infamous å, ä and ö characters).