Change the UniversalLanguageSelector MediaWiki extension to use https://www.mediawiki.org/wiki/File:Gear_icon.svg as a basis for the gear sprite.  It must use the SVG in supported browsers, but still render (using PNG) in older browsers.

There is currently files called cog-sprite.svg and cog-sprite.png.  You will need to replace the gears in cog-sprite.svg with the one from Gear_icon.svg.  You must edit it to be the same dimensions and colors, both for the overall SVG and for the individual gears.  When done with the SVG, simply re-render the PNG from it.

Please read https://bugzilla.wikimedia.org/show_bug.cgi?id=50843 before starting.

Students are required to read Wikimedia's general instructions first.