Manage login and logout in mobile view

front/src/locales/en.json

@@ -20,11 +20,13 @@
     "coverupload":"Upload cover"
   },
   "signup": {
+    "title":"Sign up",
     "username":"Username",
     "password":"Password",
     "signup":"Sign up"
   },
   "login": {
+    "title":"Log in",
     "username":"Username",
     "password":"Password",
     "login":"Log in"

front/src/locales/fr.json

@@ -20,14 +20,16 @@
     "coverupload":"Téléverser la couverture"
   },
   "signup": {
+    "title":"Inscription",
     "username":"Nom d'utilisateur",
     "password":"Mot de passe",
     "signup":"S'inscrire"
   },
   "login": {
+    "title":"Connexion",
     "username":"Nom d'utilisateur",
     "password":"Mot de passe",
-    "login":"Connexion"
+    "login":"Se connecter"
   },
   "bookbrowser": {
     "error": "Erreur pendant le chargement des livres: {error}",