Got rid of Transcommu.

 - Transcommu didn't get any traction, we'll just point users to github.com's wiki
to explain about translation process and Bitcoin tips.

 - Added new `UIUtils.openURL(Context ctx, String url)` method (refactored `SearchResultListAdapter.java` to use it)

 - Cleaned up `AndroidManifest.xml` from activities and services that no longer exist.