Bug 16241: Move staff client CSS out of language directory

Bug 16241: Move staff client CSS out of language directory

This patch corrects CSS paths in three places I missed.

To test, apply this follow-up and:

- View the patron detail page. DataTables should be styled correctly.
- View the tag review page. DataTables should be styled correctly.
- From the tag review page, click any tag to see a list of titles with
  that tag. The DataTable on that page should be styled correctly.

Signed-off-by: Hector Castro <hector.hecaxmmx@gmail.com>
Works as expected

Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>