arch: support translations

Author: sylvestre

src/uu/arch/arch.md

@@ -0,0 +1,6 @@
+# Error message when system architecture information cannot be retrieved
+cannot-get-system = cannot get system name
+
+arch-usage = arch
+arch-about = Display machine architecture
+arch-after-help = Determine architecture name for current machine.

src/uu/arch/locales/en-US.ftl

@@ -0,0 +1,6 @@
+# Error message when system architecture information cannot be retrieved
+cannot-get-system = impossible d'obtenir le nom du système
+
+arch-usage = arch
+arch-about = Afficher l'architecture de la machine
+arch-after-help = Déterminer le nom de l'architecture pour la machine actuelle.

src/uu/arch/locales/fr-FR.ftl

@@ -7,16 +7,15 @@ use platform_info::*;
 
 use clap::Command;
 use uucore::error::{UResult, USimpleError};
-use uucore::{help_about, help_section};
-
-static ABOUT: &str = help_about!("arch.md");
-static SUMMARY: &str = help_section!("after help", "arch.md");
+use uucore::locale::{self, get_message};
 
 #[uucore::main]
 pub fn uumain(args: impl uucore::Args) -> UResult<()> {
+    locale::setup_localization("src/uu/arch/locales/")?;
     uu_app().try_get_matches_from(args)?;
 
-    let uts = PlatformInfo::new().map_err(|_e| USimpleError::new(1, "cannot get system name"))?;
+    let uts =
+        PlatformInfo::new().map_err(|_e| USimpleError::new(1, get_message("cannot-get-system")))?;
 
     println!("{}", uts.machine().to_string_lossy().trim());
     Ok(())
@@ -25,7 +24,7 @@ pub fn uumain(args: impl uucore::Args) -> UResult<()> {
 pub fn uu_app() -> Command {
     Command::new(uucore::util_name())
         .version(uucore::crate_version!())
-        .about(ABOUT)
-        .after_help(SUMMARY)
+        .about(get_message("arch-about"))
+        .after_help(get_message("arch-after-help"))
         .infer_long_args(true)
 }