i18 replacement for the rust-i18n

The debian/missing-sources/locale.rs is designed to avoid dependency problem of the rust-i18n, which was not packaged in debian when doing packaging for the pay-respects.

This replacement is inspired by and adopted from the patch by Blair Noctis <ncts@debian.org> at
https://salsa.debian.org/debian/trippy/-/blob/80ed8e41/debian/patches/ad-hoc-i18n.patch


