Terms listing improvements fixes

[BlueFox4]

Some changes made to the listing page of a given term, including

• added support for translating the "Posts for" string (non-breaking!)
• fixed wrong uppercase/lowercase format of the Term Name caused by using .Title instead of .Name on the term page
• beautified it a little bit (but if not wanted just don't take that commit): the term name now appears a little lighter/darker than the rest of the page title (opacity: 0.5)

Anything I missed? Something not as expected? Please let me know, I just want to make the theme even better!