Special Characters in guild-names

[Ziro_of_the_Turks]

It seems that special-characters do not work with the guild control panel.
Is there anyone around this?

In this specific case, I'm trying to help someone in my guild be able to use the symbol † in his nickname. This symbol displays properly in-game, and on local-tags (it can be in a local guild member's nickname AND in the local guild-name itself). It also used to work fine before (maybe on the old guild CP), but I can't get it working now

It won't even display on the text-box in the guild control panel.