Updated mediawiki/extensions
Project: mediawiki/extensions/MobileFrontend  98e9bd0f186d0a5d06b0b10e840f1d53d449dcf2

Story 1346: Edit overlay UI overhaul

Also, change @grayLight color to #cacaca, per Kaity's previous instructions
and remove .cancel for buttons (not used anymore).

Change-Id: I677aa4b79ee247c1accda67b697f1fbd9e278583