keyboard (language) icon missing

Keyboard icons missing in gnome-flashback


create a new theme

mkdir -p ~/.icons/addflags/status/22

create file ~/.icons/addflags/index.theme with the following content

[Icon Theme]
Name=addflags
Comment=Smooth modern theme designed to be intuitive.
Inherits=moblin

Example=directory-x-normal

#Directory list
Directories= status/22

[status/22]
Size=22
Context=Status
Type=Fixed

where Inherits is the theme you want to use

set the theme (e.g. by gnome-tweak-tool)  to addflags


status/22 contains the icons indicator-keyboard-*.svg
taken from example from
  usr/share/icons/ubuntu-mono-dark/status/22/
(sudo apt-get install ubuntu-mono)