Move list of available translations to its own page under About
Moving the list of available translations away from the homepage and into it's own page under the About section makes the homepage cleaner. We still have a paragraph in the homepage where we mention that pidgin has a variety of translations and link to the corresponding new page.
Testing Done:
Ran `dev-server.sh` and verified the contents looked the way they are expected to
Reviewed at https://reviews.imfreedom.org/r/519/