hwaccel: uniformize plugin descriptions

modules/codec/avcodec/hwdummy.c

@@ -39,7 +39,7 @@ static int Open(vlc_va_t *, AVCodecContext *, const es_format_t *);
 static void Close(vlc_va_t *);
 
 vlc_module_begin()
-    set_description(N_("Dummy video decoding accelerator"))
+    set_description(N_("Dummy video decoder"))
     set_capability("hw decoder", 0)
     set_category(CAT_INPUT)
     set_subcategory(SUBCAT_INPUT_VCODEC)

modules/codec/avcodec/vaapi.c

@@ -59,9 +59,9 @@ static void Delete( vlc_va_t * );
 
 vlc_module_begin ()
 #if defined (VLC_VA_BACKEND_XLIB)
-    set_description( N_("Video Acceleration (VA) API / X11") )
+    set_description( N_("VA-API video decoder via X11") )
 #elif defined (VLC_VA_BACKEND_DRM)
-    set_description( N_("Video Acceleration (VA) API / DRM") )
+    set_description( N_("VA-API video decoder via DRM") )
 #endif
     set_capability( "hw decoder", 0 )
     set_category( CAT_INPUT )

modules/hw/vdpau/avcodec.c

@@ -42,7 +42,7 @@ static int Open(vlc_va_t *, AVCodecContext *, const es_format_t *);
 static void Close(vlc_va_t *);
 
 vlc_module_begin()
-    set_description(N_("VDPAU hardware-accelerated decoder"))
+    set_description(N_("VDPAU video decoder"))
     set_capability("hw decoder", 100)
     set_category(CAT_INPUT)
     set_subcategory(SUBCAT_INPUT_VCODEC)