Bug 964034 - (gaia-rtl) Support RTL for Music App

Used <i>dir="auto"</i> along </i>:dir</i> pseudo class to make it *look and feel* smarter.
</br>Please refer to https://bugzilla.mozilla.org/show_bug.cgi?id=964034#c1 for a screenshot of the work that's been done so far. :)