Add translations for “Alaska”, “Arizona”, “Hawaii”, “Mountain”, “Central”, “Eastern” for timezone id translations
Add direct translations  for “US/Pacific”

“Pacific” has a different meaning in timezone ids like “US/Pacific”
and “Pacific/Tahiti”, “Pacific/Galapagos”, ... I.e. only one of
these meanings of “Pacific” can be translated by using the partial
translations in timezoneidparts.xml.  It is easiest to translate
“US/Pacific” directly in timezones.xml.
Add translations for timezone id part “Pacific”
Add translations for timezone id part “Indian”

(= Indian Ocean)
Add translations for timezone id part “Atlantic”
Add translations for timezone id part “Arctic”
Add test cases for timezone id translations