Updated mediawiki/extensions
Project: mediawiki/extensions/MobileFrontend  9b2149e4ad36c3189cc7b85f40de72b5c7318326

Make collapsible sections accessible to screen reader users

I've addedd the relevant aria attributes so that screen reader
users can know about the collapsible sections.

Change-Id: Ie176f7fda685c320e7bc2fc740be59194adba945