l10n: port tty to translation + add french

Author: sylvestre

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

@@ -1,2 +1,8 @@
 tty-about = Print the file name of the terminal connected to standard input.
 tty-usage = tty [OPTION]...
+
+# Help messages
+tty-help-silent = print nothing, only return an exit status
+
+# Output messages
+tty-not-a-tty = not a tty

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

@@ -0,0 +1,8 @@
+tty-about = Afficher le nom de fichier du terminal connecté à l'entrée standard.
+tty-usage = tty [OPTION]...
+
+# Messages d'aide
+tty-help-silent = n'afficher rien, retourner seulement un code de sortie
+
+# Messages de sortie
+tty-not-a-tty = n'est pas un tty

src/uu/tty/src/tty.rs

@@ -2,8 +2,6 @@
 //
 // For the full copyright and license information, please view the LICENSE
 // file that was distributed with this source code.
-//  *
-//  * Synced with http://lingrok.org/xref/coreutils/src/tty.c
 
 // spell-checker:ignore (ToDO) ttyname filedesc
 
@@ -41,7 +39,7 @@ pub fn uumain(args: impl uucore::Args) -> UResult<()> {
         Ok(name) => writeln!(stdout, "{}", name.display()),
         Err(_) => {
             set_exit_code(1);
-            writeln!(stdout, "not a tty")
+            writeln!(stdout, "{}", get_message("tty-not-a-tty"))
         }
     };
 
@@ -65,7 +63,7 @@ pub fn uu_app() -> Command {
                 .long(options::SILENT)
                 .visible_alias("quiet")
                 .short('s')
-                .help("print nothing, only return an exit status")
+                .help(get_message("tty-help-silent"))
                 .action(ArgAction::SetTrue),
         )
 }