Removed some (hidden) Cleanspeech cruft that had been used to disable effects. Made some static text open to translation. Added more i18n hints (thanks Thomas Breinstrup).

src/VoiceKey.cpp

@@ -85,6 +85,11 @@ sampleCount VoiceKey::OnForward (WaveTrack & t, sampleCount start, sampleCount l
 
    if((mWindowSize) >= len+10){
 
+      /* i18n-hint: Voice key is an experiemental/incomplete feature that 
+         is used to navigate in vocal recordings, to move forwards and
+         backwards by words.  So 'key' is being used in the sense of an index.
+         This error message means that you've selected too short 
+         a region of audio to be able to use this feature.*/
       wxMessageBox(_("Selection is too small to use voice key."));
       return start;
    }