I noticed this on local install, as well as on https://secure.phabricator.com
Using Firefox, navigate to https://secure.phabricator.com/conpherence/
Notice the sidebar text for "Search" is in strange font.
{F388626}
I found it more apparent when using Such English/Wow translation on my local install (on 6575cc568dabf7e487ae0c77b739ad259ae080ad) :
{F388628}