Due to a namespace clash with OOUI the download icon changes unintentionally when you open the editor. We will fix this and prevent similar issues from happening again.
* Visit any page on English Wikipedia with download button (Chrome)
* Click edit
* Close editor overlay
* Watch the icon glyph change
{F11210377}
{F11210378}
= Acceptance criteria
[] All icons will be prefixed with `mf-` (mobilefrontend) or `minerva-` (Minerva skin) from now on to limit the icon to the domain intended so that this doesn't happen again.
[x] We'll fix the download icon issue
= Testing criteria
* Visit any page on English Wikipedia with download button (Chrome)
* Observe the download icon
* Click edit
* Close editor overlay
* The download icon should look exactly the same as before.
* Check icons in the main menu
* Visit a user page that exists (https://en.m.wikipedia.beta.wmflabs.org/wiki/User:Jdlrobson) and a user page that doesn't exist (https://en.m.wikipedia.beta.wmflabs.org/wiki/User:Test_Account_0.4398024436118293) and check all icons display correctly.
* Check icons in the search experience
* Check icons in the editor experience