(Hopefully) based on what @dstftw suggested.
It is better to avoid bool(int(...)) because it is fragile.
Avoid code duplication in video_base initialization.
Some videos can have a `data-video-available_abroad' attribute that
can be "0" or "1" depending if the video is available abroad (if
not present it is available abroad).
For not available abroad videos (all the ones with
data-video-available_abroad="1") video-ita.internazionale.it is
used instead of video.internazionale.it.
Adjust Internazionale extractor to reflect that and add a test for
a not available abroad video.
