Updated mediawiki/extensions
Project: mediawiki/extensions/SecureHTML  705f711ac19f16f3408379485e766ed9a9b59471

Add i18n message documentation

Per https://www.mediawiki.org/wiki/I18n#Message_documentation .
Also, adjust URL to https for Translatewiki.net.

Change-Id: I3676fa787bde90b14ed3dad6d737f0c31359beef