Updated mediawiki/extensions
Project: mediawiki/extensions/UniversalLanguageSelector  9f51d8a4eabf976ac02e0719907b1b07cb543c45

README Updates

1. Updated instruction to enable ULS in LocalSettings.php
2. Wrapped text to 80 chars.
3. Removed unused Change Log section.
4. Added short information about ULS.
5. Updated 'For developers' information.

Change-Id: Iebc8b923cbfcbb8f39e45e12d1e2e5c835076dd2