l18n, tinymce, menu, br cleanup, 404, home

* Added various l18n improvements
* Tinymce editor now outputs BR instead of P when pressing enter, and
outputs P when pressing SHIFT-ENTER
* Menu now has new layout implementation to support center aligning the
menu contents (fixing bug that produces horizontal scrolling bar)
* Improved 404 and home detection, preventing the system to create
endless draft versions