Expand the info in 'resettokens-watchlist-token'

"Watchlist web feed token", while beautifully terse, is a nightmare to
translate and might not actually provide enough information.

Change-Id: I00e686c1debbb6ea1e1a2c4b50cd432267580e0c
Merge "Expand the info in 'resettokens-watchlist-token'"