[options] Clarify language tags
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		@@ -380,7 +380,7 @@ def parseOpts(overrideArguments=None):
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        '--sub-lang', '--sub-langs', '--srt-lang',
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        action='callback', dest='subtitleslangs', metavar='LANGS', type='str',
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        default=[], callback=_comma_separated_values_options_callback,
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        help='Languages of the subtitles to download (optional) separated by commas, use IETF language tags like \'en,pt\'')
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        help='Languages of the subtitles to download (optional) separated by commas, use --list-subs for available language tags')
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    downloader = optparse.OptionGroup(parser, 'Download Options')
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    downloader.add_option(
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