Support for trailers at main Norwegian cinema site

[forthrin]

• I've verified and I assure that I'm running youtube-dl 2018.08.04
• At least skimmed through the README, most notably the FAQ and BUGS sections
• Searched the bugtracker for similar issues including closed ones
• Checked that provided video/audio/playlist URLs (if any) are alive and playable in a browser
• Site support request (request for adding support for a new site)

$ youtube-dl --verbose 'https://www.nfkino.no/oslo/article1330423.ece'
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: [u'--verbose', u'https://www.nfkino.no/oslo/article1330423.ece']
[debug] Encodings: locale UTF-8, fs utf-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2018.08.04
[debug] Python version 2.7.15 (CPython) - Darwin-16.7.0-x86_64-i386-64bit
[debug] exe versions: ffmpeg 4.0.1, ffprobe 4.0.1, rtmpdump 2.4
[debug] Proxy map: {}
[generic] article1330423: Requesting header
WARNING: Falling back on generic information extractor.
[generic] article1330423: Downloading webpage
[generic] article1330423: Extracting information
ERROR: Unsupported URL: https://www.nfkino.no/oslo/article1330423.ece
Traceback (most recent call last):
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/generic.py", line 2309, in _real_extract
    doc = compat_etree_fromstring(webpage.encode('utf-8'))
  File "/usr/local/bin/youtube-dl/youtube_dl/compat.py", line 2542, in compat_etree_fromstring
    doc = _XML(text, parser=etree.XMLParser(target=_TreeBuilder(element_factory=_element_factory)))
  File "/usr/local/bin/youtube-dl/youtube_dl/compat.py", line 2531, in _XML
    parser.feed(text)
  File "/usr/local/Cellar/python@2/2.7.15_1/Frameworks/Python.framework/Versions/2.7/lib/python2.7/xml/etree/ElementTree.py", line 1659, in feed
    self._raiseerror(v)
  File "/usr/local/Cellar/python@2/2.7.15_1/Frameworks/Python.framework/Versions/2.7/lib/python2.7/xml/etree/ElementTree.py", line 1523, in _raiseerror
    raise err
ParseError: mismatched tag: line 451, column 2
Traceback (most recent call last):
  File "/usr/local/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 792, in extract_info
    ie_result = ie.extract(url)
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/common.py", line 502, in extract
    ie_result = self._real_extract(url)
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/generic.py", line 3274, in _real_extract
    raise UnsupportedError(url)
UnsupportedError: Unsupported URL: https://www.nfkino.no/oslo/article1330423.ece
$