Updated mediawiki/extensions
Project: mediawiki/extensions/MobileFrontend  96b974a4fcecfe56a484b32e6d965944224e5e75

Use less function to embed editor images

Use .background-image() in editor.less, instead of embed images
directly.

Bug: 71608
Change-Id: I33e1b34bcada27f68c44eecded6f61867dd590eb