init browse MenuItem properly

vlc-android/src/org/videolan/vlc/gui/MainActivity.java

@@ -220,6 +220,8 @@ public class MainActivity extends SherlockFragmentActivity {
     public boolean onCreateOptionsMenu(Menu menu) {
         MenuInflater inflater = getSupportMenuInflater();
         inflater.inflate(R.menu.media_library, menu);
+        MenuItem browse = menu.findItem(R.id.ml_menu_browse);
+        browse.setTitle(mMediaLibraryActive ? R.string.directories : R.string.media_library);
         return super.onCreateOptionsMenu(menu);
     }