Fixes #7283: using translate filter in <th> to avoid infinite loop.

Changing this table header to match the rest of the ones in bastion
and thus avoiding an infinite loop created by the interaction between
the translate and sortable directives.

http://projects.theforeman.org/issues/7283
I promise I did read it, just didn't pick up on that. This does make things confusing and unobvious which way to go when looking at an existing table as an example. Be cool if there was a way to check for this situation.