mpv: unspecify audio and subtitle languages

conf/mpv.conf

@@ -1,5 +1,8 @@
 # <~/.config/mpv/mpv.conf|~/.var/app/io.mpv.Mpv/config/mpv/mpv.conf>
 
+# REMEMBER! Audio and subtitle languages are not specified, use --{a,s}lang
+# or --{a,s}id to specify!
+
 # Preferred audio drivers, but by trailing comma, let others be used too.
 ao=pipewire,pulse,
 # And same for video output drivers
@@ -17,11 +20,19 @@ gpu-context=auto
 video-sync=display-resample
 interpolation
 
-# Specify preferred audio and subtitle languages. Two subtitles are shown
-# simultaneously, one on top, another on bottom.
-# REMEMBER to override this with --alang= --slang= as needed!
-alang=jpn,jp,ja,en,eng,fi,fin,de,deu,ger
-slang=fi,fin,sdh,doh,en,eng,eo,epo,la,lat,de,deu,ger,sv,swe,ru,rus,cs,ces,cze,es,spa,jpn,jp
+# Use whatever (audio) track is the default
+track-auto-selection=yes
+aid=auto
+
+# Allow same aid/sid language
+subs-with-matching-audio=yes
+# Consider OS language if no slang specified
+subs-match-os-language=yes
+# Permit subtitle fallback to unspecified languages
+subs-fallback=yes
+# Always use forced subtitle tracks (no idea if two can be forced, but if not,
+# there is always the secondary sid)
+subs-fallback-forced=always
 
 # Remember quit position even without Shift+Q
 save-position-on-quit