elementary OS 글자 물결처럼 깨졌을 떄

Just run the following lines on terminal, then reset the system normally. Done.

gsettings reset org.gnome.desktop.interface font-name
gsettings reset org.gnome.desktop.interface document-font-name
gsettings reset org.gnome.desktop.interface monospace-font-name
gsettings reset org.gnome.desktop.wm.preferences titlebar-font
gsettings reset org.gnome.nautilus.desktop font
gsettings reset org.gnome.desktop.interface text-scaling-factor 

Only thing I don't understand is why the screenshot app (named just screenshot-tool) causes this. Seems like a bug to me.