Make classes which are not extended final. This gives a clear indication of such.
Generic cleanup and simplifications.

Just some really generic things that simplify existing code among other things.
Remove non-existant activities from the manifest.
Use a precomposed ellipsis for the asset extraction string in strings.xml
Initial basic multi-language support.
RetroArch now fully capable of multi-language support.
Missed one string in DisplayRefreshRateTest.java. Now everything that matters should be within strings.xml now.
Merge pull request #311 from lioncash/master

Multi-language support for the Android version of the front-end. Also some very tiny simplifications.