window: Toggle search with Ctrl+F
window: Toggle search with Ctrl+F

Suggested by Adrien Plazas in:
https://bugzilla.gnome.org/show_bug.cgi?id=783859

GNOME/gnome-characters,GNOME/gnome-characters,GNOME/gnome-characters,GNOME/gnome-characters,GNOME/gnome-characters