Remove trailing "." from checkbox strings
It seems there are some strings for checkboxes that ends with a ".". I think they should not end with a ".".
Examples:
https://gitlab.gnome.org/GNOME/seahorse/-/blob/master/gkr/gkr-keyring.vala#L266
https://gitlab.gnome.org/GNOME/seahorse/-/blob/master/pgp/seahorse-gpgme-secret-deleter.c#L64
https://gitlab.gnome.org/GNOME/seahorse/-/blob/master/pkcs11/pkcs11-key-deleter.vala#L34
https://gitlab.gnome.org/GNOME/seahorse/-/blob/master/ssh/deleter.vala#L43
Might be more.
This translation string does not contain the ".":
https://gitlab.gnome.org/GNOME/seahorse/-/blob/master/help/C/pgp-delete.page#L65