mpv: add slang for Latin

I expect to never see this, but I am open to a pleasant surprise

conf/mpv.conf

@@ -8,7 +8,7 @@ ao=pipewire,pulse,
 # My mpv usage has mostly been anime, but there is occassional English one too
 alang=jpn,jp,ja,en,eng
 # but I still prefer to have subtitles. Note that two are shown simultaneously.
-slang=fi,fin,sdh,doh,en,eng,eo,epo,sv,swe,ru,rus,cs,ces,cze,es,spa,jpn,jp
+slang=fi,fin,sdh,doh,en,eng,eo,epo,la,lat,sv,swe,ru,rus,cs,ces,cze,es,spa,jpn,jp
 
 # Subtitle font, although only one is allowed at a time?
 #sub-font='Noto Serif Regular'