Archivebot: support all languages and timezones.

Necessary info are retrieved directly from site.
No use of locale should be necessary any longer.

Patch adapted for core by Merlijn van Deen <valhallasw@gmail.com>

Change-Id: Iede5165fd36b8e5747db032183094fa11177b037
Merge "Archivebot: support all languages and timezones."