MBS-7707: Sort work attributes in the sidebar

Uh. Doesn’t need an explanation, I think.

Compare http://bitmap.mbsandbox.org/work/bb56168b-dede-4fd2-bedf-3f3a8fbbaa43 to http://chirlu.mbsandbox.org/work/bb56168b-dede-4fd2-bedf-3f3a8fbbaa43