Keyboard shortcut Ctrl+F isn't working in the template editor.

When a user hits Ctrl+F the ACE editor tries to load its searbox extension but apparently it fails. The log of the browser's network traffic shows GET request to https://<FOREMAN_URL>/templates/ext-searchbox.js that returns 404.

Reproducer steps:
- open a detail page of a provisioning template
- click on the editor textarea (to make sure it gets focus)
- press Ctrl+F

Current results:
Nothing happens.

Expected results:
It should open a searchbox within the template editor.