gettext-rs development locale dir search path

gettext-search-path.rs

fn main() -> gtk::glib::ExitCode {
    let mut textdomain = gettextrs::TextDomain::new(GETTEXT_PACKAGE);
    if cfg!(debug_assertions) {
        // Add extra search path for debug builds so we don't have to install
        textdomain = textdomain.prepend("../locale-test");
    }
    _ = textdomain.init().map_err(|x|{
        // TranslationNotFound is not a fatal error, fallback to msgid (english)
        if !matches!(x, TextDomainError::TranslationNotFound(_)) {
            panic!("Unable to setup gettext!")
        }
    });

}