Freeze break notification: link to files
The current notifications just contain the new strings, without any context, like this.
- `Low Battery``
it would be helpful to have a link, to be able to see the string in context, like this:
- `Low Battery` ([plugins/power/gsd-power-manager.c](https://gitlab.gnome.org/GNOME/gnome-settings-daemon/-/blob/daaa85d69757a62f99d0730715490a0daf31b231/plugins/power/gsd-power-manager.c#L798)