Fix minor typo in French translation

locale/translations/fr_FR.json

@@ -108,7 +108,7 @@
     "page.history.title": "Historique",
     "page.import.title": "Importation",
     "page.search.title": "Résultats de la recherche",
-    "page.about.title": "A propos",
+    "page.about.title": "À propos",
     "page.about.credits": "Crédits",
     "page.about.version": "Version :",
     "page.about.build_date": "Date de la compilation :",