FeaturedFeeds for Wiktionary

Add 'wotd' feed for Wiktionary.  It is intended to cover
Word of the Day, Word of the Week, and other entries about
words featured on Wiktionary.

Bug: 66015
Change-Id: If3b62ee89ac20952772db95e448844cc0225a80f
Merge "FeaturedFeeds for Wiktionary"