sublanguageid-eng : Filters specifically for English subtitles.
sublanguageid-slo or sublanguageid-sk : Filters for Slovak subtitles (as seen in your snippet). Related Search Features www.opensubtitles.org/sk/search/sublanguageid-a...
: Parameters like season-[Number] and episode-[Number] allow for direct navigation to specific TV episodes. www.opensubtitles.org/sk/search/sublanguageid-a...