Add buttons on book form

front/src/locales/en.json

@@ -41,6 +41,9 @@
     "wantread": "I want to read it"
   },
   "bookform": {
-    "error": "Error when loading book: {error}"
+    "error": "Error when loading book: {error}",
+    "read": "Read",
+    "startread": "Started",
+    "wantread": "Interested"
   }
 }

front/src/locales/fr.json

@@ -41,6 +41,9 @@
     "wantread": "Je veux le lire"
   },
   "bookform": {
-    "error": "Erreur pendant le chargement du livre: {error}"
+    "error": "Erreur pendant le chargement du livre: {error}",
+    "read": "Lu",
+    "startread": "Commencé",
+    "wantread": "Intéressé"
   }
 }