Fix custom local MediaWiki:Helppage values

Followup to 3a6ea89d4aa4a0fbc36a209fa13b1c6134110ca9

Change-Id: I7effec352d263f536d1d1763e9cd56d2f5154f13
(cherry picked from commit dbede6aad31752fdfe317f7eb66fb1c47c4ec5d4)