TT#85156 Apply consistent language labels style

The list looks like:

| English
| français
| Italiano
| Español
| Deutsch

Use uppercase `Français` to be consistent.

Change-Id: Ia3f1087c10d2d816c43835993e536d797d088f5c

src/locales/fr.json

@@ -9,7 +9,7 @@
     "sendFax": "Envoyer un Fax",
     "loggedInAs": "Connecté en tant que",
     "notFound": "Erreur 404",
-    "languageLabel": "français",
+    "languageLabel": "Français",
     "buttons": {
         "cancel": "Annuler",
         "save": "Enregistrer",