If you reassign the shortcut to "%s", the "%s" shortcut will be disabled.
331
panels/info-overview/cc-info-overview-panel.c:443
Englishtranslators: This is the name of the OS, followed by the build ID, for
* example:
* "Fedora 25 (Workstation Edition); Build ID: xyz" or
* "Ubuntu 16.04 LTS; Build ID: jki"
%s; Build ID: %s
466
panels/keyboard/cc-keyboard-shortcut-editor.c:390
EnglishTRANSLATORS: Don't translate/transliterate <b>%s</b>, which is the accelerator used
<b>%s</b> is already being used for %s. If you replace it, %s will be disabled