3730 & 3731 Add commas and fix HTML on a tag set's page

http://code.google.com/p/otwarchive/issues/detail?id=3730 and http://code.google.com/p/otwarchive/issues/detail?id=3731

Categories, Ratings, and Warnings on tag sets were all lumped together when they should've been separated by commas for easier reading. The `<div class="tagset home">` wasn't closed, there was a `<div class="clear"><!--clear stats--></div>` that didn't belong, and the `<dd>` that pairs with the Description `<dt>` wasn't closed in the proper place.

Also adds translation strings and fixes whitespace and capitalizes labels of types of allowed nominations.
Aha! I know why Travis fails: the closing ruby tag (```%>```) is missing, right before the closing ```li```.