Updated languages for the top menu.

The language menu is shown for our online version. This adds additional
language titles which would have otherwise ended up rendered as blank
links.
Grab all XSLT instead of explicitly listing them

For releases, we'd like to include all the XSLT since they are
build/release relevant (at the moment that is). Explicitly listing them
could break the release by forgetting important XSLT files our build
system depends on.