Don't work shortcut <Ctrl> S for swap language

`text-translator` from ~master

    % uname -sr
    Linux 4.15.17-200.fc26.x86_64
    % gnome-shell --version
    GNOME Shell 3.24.3

In settings window (from tweak tools) no switch language shortcut, only 
* Open translator dialog `Super+T`
* Translate from clipboard `Shift+Super+T`
* Translate from primary selection `Alt+Super+T`
