(I thought we already have this task, but i couldn't find it?)
After https://gerrit.wikimedia.org/r/#/c/193373/ the font changer in alpha mode is useless, because there is no content on Special:MobileMenu where you can change the font size (sure, it will be saved, but you can't see any difference).
So we need to find a new place for the font changer link :)
Change 202077 had a related patch set uploaded (by Florianschmidtwelzow):
Disable mobile.fontchanger after it is useful again
Change 202077 merged by jenkins-bot:
Disable mobile.fontchanger after it is useful again
@JKatzWMF: Not really :) We still need, like KLans_WMF wrote, some design input. My change only disables the fontchanger (because it's useless now). After we have a better position for the fontchanger link (somewhere on the article page), we can reactivate it :)
Change 213288 had a related patch set uploaded (by Florianschmidtwelzow):
Re-enable fontchanger in alpha
Like i wrote in the commit message: The main menu is rendered via JS again, so the font changer can get it's old place :)