.additional-links is pushed out from the left of display name.
This display name box has max-width: 400px, but it's too wide for mods with more tabs and menus.
When a mod access a user profile with a long display name, the max width has been set to 150px, which should be enough to not drop the mod items down.
In these cases, a tooltip with the full display name will be set on the truncated display name.
