Support additional timezone names

[niccokunzmann]

These timezone names should be supported:

• https://github.com/unicode-org/cldr/blob/latest/common/bcp47/timezone.xml
• https://github.com/dmfilipenko/timezones.json/blob/master/timezones.json
• https://babel.pocoo.org/en/latest/dates.html#localized-time-zone-names
• https://gemini.google.com/share/6b38d8b22c2f

Also, what we would probably want is this:

• translation
• location
• cities in all different languages
• a map

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