archivebot: localized duration (hours, days) in edit summary

Patch contributed by Andrei Stroe at http://sourceforge.net/p/pywikipediabot/patches/561/ .
Modified to conform with the current framework.

Bug: 54560
Change-Id: I0453a467e28a25e11051810c93e6787c8b9c8517
Merge "archivebot: localized duration (hours, days) in edit summary"