Bug 16098: Making subscription fields actions buttons

Bug 16098: Making subscription fields actions buttons

To test:
1) Go to Serials -> Add subscription fields
2) Confirm actions "Edit" and "Delete" now show as buttons and work as
   expected
3) When you make your browser narrow, confirm that the Actions column
   does not wrap
4) Confirm that you cannot sort on the Actions column

Sponsored-by: Catalyst IT
Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Brendan Gallagher brendan@bywatersolutions.com