Portuguese translation, bug fixes, minor updates

54147c7 Bug fix: allow accepting group ownership
632561b A few more try/catches in media player.
5419e4c Added Portuguese translations support, thanks @ericcontainer
fd7ce30 Clear recorder's WaveDrawable when record is deleted.
797d8fa Add try/catch around MediaPlayer.setDataSource.
714d0d5 Prevent race condition between media players.