Fixed: Parsing of WebVTT subtitles which contain text after the WEBVTT keyword #1918
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Functional description
Fixing helper that converts WebVTT to SRT subtitle format for WebVTT files with a slightly uncommon format.
Reasoning
NRK was consistently using a format that the parser didn't handle appropriately, which broke most, if not all subtitles on NRK.
Technical description
According to https://www.w3.org/TR/webvtt1/#webvtt-file-body the WebVTT format allows arbitrary text after the "WEBVTT" keyword. With the previous parser implementation those lines where not ignored like they should.