sublanguageid-slo or sublanguageid-sk : Filters for Slovak subtitles (as seen in your snippet). Related Search Features
If you are trying to find subtitles for a specific film in all languages, ensure your URL contains sublanguageid-all to avoid the default language filtering. Запрошены субтитры - opensubtitles.org Запрошены субтитры - opensubtitles.org. Open Subtitles bipuldey19/Opensubtitles-Unofficial-API - GitHub www.opensubtitles.org/sk/search/sublanguageid-a...
sublanguageid-eng : Filters specifically for English subtitles. www.opensubtitles.org/sk/search/sublanguageid-a...
The site uses several other URL-based features to refine searches: www.opensubtitles.org/sk/search/sublanguageid-a...