3913 Tag status options on wrangling pages need span_if_current

https://code.google.com/p/otwarchive/issues/detail?id=3913

Like our other links, the wrangling pages' All, Canonical, Non-canonical, Unfilterable, Unwrangled, and Unwrangleabe links should turn into spans with the "current" class, which will given them the appearance of a pressed button, when the user is currently on that page (e.g. if I'm viewing all the tags, All should have the current state; if I'm viewing the canonical tags, Canonical should have the current state; etc).

This also fixes the lowercase link and label text that was still lingering after two and a half years, sob, and stops "There are no tags in this category at the moment" from floating up by the buttons.