l10n: port tac for translation + add french

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

@@ -1,2 +1,12 @@
 tac-about = Write each file to standard output, last line first.
 tac-usage = tac [OPTION]... [FILE]...
+tac-help-before = attach the separator before instead of after
+tac-help-regex = interpret the sequence as a regular expression
+tac-help-separator = use STRING as the separator instead of newline
+
+# Error messages
+tac-error-invalid-regex = invalid regular expression: { $error }
+tac-error-invalid-argument = { $argument }: read error: Invalid argument
+tac-error-file-not-found = failed to open { $filename } for reading: No such file or directory
+tac-error-read-error = failed to read from { $filename }: { $error }
+tac-error-write-error = failed to write to stdout: { $error }

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

@@ -0,0 +1,12 @@
+tac-about = Écrit chaque fichier sur la sortie standard, la dernière ligne en premier.
+tac-usage = tac [OPTION]... [FICHIER]...
+tac-help-before = attacher le séparateur avant plutôt qu'après
+tac-help-regex = interpréter la séquence comme une expression régulière
+tac-help-separator = utiliser CHAÎNE comme séparateur au lieu du saut de ligne
+
+# Messages d'erreur
+tac-error-invalid-regex = expression régulière invalide : { $error }
+tac-error-invalid-argument = { $argument } : erreur de lecture : Argument invalide
+tac-error-file-not-found = échec de l'ouverture de { $filename } en lecture : Aucun fichier ou répertoire de ce type
+tac-error-read-error = échec de la lecture depuis { $filename } : { $error }
+tac-error-write-error = échec de l'écriture vers stdout : { $error }

src/uu/tac/src/error.rs

@@ -3,37 +3,35 @@
 // For the full copyright and license information, please view the LICENSE
 // file that was distributed with this source code.
 //! Errors returned by tac during processing of a file.
-use thiserror::Error;
 
+use std::collections::HashMap;
+use thiserror::Error;
 use uucore::display::Quotable;
 use uucore::error::UError;
+use uucore::locale::get_message_with_args;
 
 #[derive(Debug, Error)]
 pub enum TacError {
     /// A regular expression given by the user is invalid.
-    #[error("invalid regular expression: {0}")]
+    #[error("{}", get_message_with_args("tac-error-invalid-regex", HashMap::from([("error".to_string(), .0.to_string())])))]
     InvalidRegex(regex::Error),
-
     /// An argument to tac is invalid.
-    #[error("{}: read error: Invalid argument", _0.maybe_quote())]
+    #[error("{}", get_message_with_args("tac-error-invalid-argument", HashMap::from([("argument".to_string(), .0.maybe_quote().to_string())])))]
     InvalidArgument(String),
-
     /// The specified file is not found on the filesystem.
-    #[error("failed to open {} for reading: No such file or directory", _0.quote())]
+    #[error("{}", get_message_with_args("tac-error-file-not-found", HashMap::from([("filename".to_string(), .0.quote().to_string())])))]
     FileNotFound(String),
-
     /// An error reading the contents of a file or stdin.
     ///
     /// The parameters are the name of the file and the underlying
     /// [`std::io::Error`] that caused this error.
-    #[error("failed to read from {0}: {1}")]
+    #[error("{}", get_message_with_args("tac-error-read-error", HashMap::from([("filename".to_string(), .0.clone()), ("error".to_string(), .1.to_string())])))]
     ReadError(String, std::io::Error),
-
     /// An error writing the (reversed) contents of a file or stdin.
     ///
     /// The parameter is the underlying [`std::io::Error`] that caused
     /// this error.
-    #[error("failed to write to stdout: {0}")]
+    #[error("{}", get_message_with_args("tac-error-write-error", HashMap::from([("error".to_string(), .0.to_string())])))]
     WriteError(std::io::Error),
 }
 

src/uu/tac/src/tac.rs

@@ -64,21 +64,21 @@ pub fn uu_app() -> Command {
             Arg::new(options::BEFORE)
                 .short('b')
                 .long(options::BEFORE)
-                .help("attach the separator before instead of after")
+                .help(get_message("tac-help-before"))
                 .action(ArgAction::SetTrue),
         )
         .arg(
             Arg::new(options::REGEX)
                 .short('r')
                 .long(options::REGEX)
-                .help("interpret the sequence as a regular expression")
+                .help(get_message("tac-help-regex"))
                 .action(ArgAction::SetTrue),
         )
         .arg(
             Arg::new(options::SEPARATOR)
                 .short('s')
                 .long(options::SEPARATOR)
-                .help("use STRING as the separator instead of newline")
+                .help(get_message("tac-help-separator"))
                 .value_name("STRING"),
         )
         .arg(