[bug #56774] support Rust programming language

[Kévin]

Follow-up Comment #2, bug #56774 (project gettext):

For reference, the gettext-rs <https://crates.io/crates/gettext-rs> crate
allows us to use _xgettext_ to translate strings.

If we only use functions, POT generation works well with Rust, detecting it
like the C language. We can apply Rust string formatting at runtime by
creating other functions around _gettext-rs_, and use the _keyword_ option to
make _xgettext_ detect those new functions.

However we lose compile-time string formatting validation. To solve that, we
need to use _macros_ whose name always ends with a _!_, which makes them
incompatible with the _keyword_ option.

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  <https://savannah.gnu.org/bugs/?56774>

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