a11y: Fix A11Y when an IP address is wrong
If a manual IP or netmask has invalid values, the only notification to the user is setting the background in red color, but no notification is sent through a screen reader.
This patch fixes this, by announcing if an IP or netmask field is wrong as soon as the user moves out of, or into, the wrong field, and also adding an icon in the entry field with the wrong value.
This patch adds extra translatable sentences for the accessibility, so it requires an update in the translations.
Forwarding: https://gitlab.gnome.org/GNOME/gnome-control-center/-/merge_requests/3180
Forwarding: https://gitlab.gnome.org/GNOME/gnome-control-center/-/merge_requests/3178
Bug-Ubuntu: https://bugs.launchpad.net/ubuntu/+source/gnome-control-center/+bug/2116943