Adapt User column size to its content

Steps to reproduce:

1. create a new user whose username is longfirstnameandlonglastgivenname with no first name and last name
2. log in with this user
3. go to her personal workspace
4. click on settings icon and add the columns State and Creation
5. Observe that the "Last contributor" column cannot fully display the username

Expected result:
The size of the "Last contributor" column (or any column using a Suggestion element) should adapt to its content. And the total table size should be expanded to have bigger columns if needed and uses a horizontal scrolling