Pontoon: Update French (fr) localization of Android L10n

Localization authors:
- Théo Chevalier <theo.chevalier11@gmail.com>
- goofy <goofy@babelzilla.org>

mozilla-mobile/fenix/app/src/main/res/values-fr/strings.xml

@@ -834,6 +834,10 @@
     <string name="sync_sent_tabs_snackbar">Onglets envoyés !</string>
     <!-- Text shown in snackbar when one tab has been sent to device  -->
     <string name="sync_sent_tab_snackbar">Onglet envoyé !</string>
+    <!-- Text shown in snackbar when sharing tabs failed  -->
+    <string name="sync_sent_tab_error_snackbar">Envoi impossible</string>
+    <!-- Text shown in snackbar for the "retry" action that the user has after sharing tabs failed -->
+    <string name="sync_sent_tab_error_snackbar_action">RÉESSAYER</string>
     <!-- Title of QR Pairing Fragment -->
     <string name="sync_scan_code">Scanner le code</string>
     <!-- Instructions on how to access pairing -->