4048 Invalid HTML on new tags page

https://code.google.com/p/otwarchive/issues/detail?id=4048

The `ul` was getting closed after every `li` instead of just at the end of the list.
Ah, okay, then we're both not sure. I just looked through some recently-changed files, and we're all over the place in our quotation mark usage, even in translation strings. We probably need to make an actual decision, announce it, document it, and start enforcing it.