4035 Improve tooltips for nominated tags

https://code.google.com/p/otwarchive/issues/detail?id=4035

We had a method for applying classes and tooltips to tags in nominations based on the tag's wrangled state, but we weren't actually using the method. Instead, we were using a less comprehensive version of the code in a view file.

The note about "#BACK END, I attempted to put titles in but it's rendering as oldtitle" is regarding the title attribute. The plugin we use for the tooltips turns the title attribute into a made-up attribute called "oldtitle" so native browser tooltips don't interfere with the fancy JavaScript tooltips, so this is expected behavior.
I was kind of torn on it, tbh. It makes sense here, but something about "This is a canonical Archive tag" seems... off to me. I don't know if it seems somehow redundant or overly specific or kind of territorial or what, but...

Maybe it'd be less weird if I eliminated the "archive" part and went with "This is a canonical tag," "This is a canonical tag but not associated with the specified fandom," "This is a synonym of an official tag," and "This is not an official tag."