Bug 857832 - [Music] Normalize search queries for songs with accented chars. r=rudyl

Add text_normalizer.js to shared/js that brings the following functionality:
- when performing a search treat accented chars as their ASCII equivalents
  (i.e. 'ö' -> 'o') thus finding artists like 'Mötley Crüe' with ASCII type
  queries like 'motley'.
Merge pull request #9641 from mcirlanaru/bug_857832

Bug 857832 - [Music] Normalize search queries for songs with accented... r=@RudyLu