Add support for zaa and mul

[owenthewizard]

No description provided.

[GitBib]

Probably better to make this change in bcp47 by re-downloading the PDF and suggesting these tweaks to bcp47.py, 'cause it'll be a pain to maintain and manage otherwise.

[owenthewizard]

Probably better to make this change in bcp47 by re-downloading the PDF and suggesting these tweaks to bcp47.py, 'cause it'll be a pain to maintain and manage otherwise.

Are und mal and zaa in the BCP47 spec? I thought they were specific to MKV.

[GitBib]

und means undetermined, but I don't know anything about mal or zaa. Any chance you could send a link with info on those two?

[GitBib]

Found 'mal' and 'zaa' in mkvmerge --list-languages. Maybe we can build on this? So pymkv can check mkvmerge's language list by itself.

[owenthewizard]

mkvmerge --list-languages only lists ISO, not BCP47. But we could check both. What do you think?

[owenthewizard]

Imo we shouldn't do any verification, just leave it up to the user and let mkvmerge throw an error.

[GitBib]

In PR #39 and #38, I disabled the BCP47 check.