Skimmable usernames

Skimmable username list

• Usernames are listed vertically, with avatars shown on alternating sides to fit more names in the same space.

Last users: only display avatars in column to the left of alphabetical list

• For users without avatars, display the 2 first characters of the name.
• Up to 15 users are displayed, last_users are not sorted alphabetically anymore (most recent user is listed first).