i18n: Revert watchlist damage caused by two word tab name

In I80895b461ee272f1a6ff54199752553426eae956 the watchlist 'Articles'
tab was switched to 'Content pages'. Having two words in a tab causes
serious layout problems on mobile. These tabs should only contain one
word.

Update qqq codes to make this clearer.
Unfortunately I can't think of a better word than article right now
so I've reverted to that pending further thought

Change-Id: I5c886450641ac86e71d26e0c7ec9caceebb2a7d3
Merge "i18n: Revert watchlist damage caused by two word tab name"