Fix subtitles validation
Fix subtitles validation

Subtitles are considered valid if their first 50 lines are

oxan/subliminal,nvbn/subliminal,Elettronik/subliminal,h3llrais3r/subliminal,ravselj/subliminal,ratoaq2/subliminal,hpsbranco/subliminal,goll/subliminal,getzze/subliminal,juanmhidalgo/subliminal,ofir123/subliminal,kbkailashbagaria/subliminal,Diaoul/subliminal,bogdal/subliminal,neo1691/subliminal,SickRage/subliminal,t4lwh/subliminal,fernandog/subliminal,pums974/subliminal