Add a shortname to USF subs decoder.

modules/codec/subtitles/subsusf.c

@@ -48,6 +48,8 @@ static subpicture_region_t *LoadEmbeddedImage( decoder_t *p_dec, subpicture_t *p
 
 vlc_module_begin();
     set_capability( "decoder", 40 );
+    set_shortname( N_("USFSubs"));
+    set_description( N_("USF subtitles decoder") );
     set_callbacks( OpenDecoder, CloseDecoder );
     set_category( CAT_INPUT );
     set_subcategory( SUBCAT_INPUT_SCODEC );