lang: add locale in django and login view

frontend/static/js/lang/en.json

@@ -11,5 +11,13 @@
 	"homeOnline": "Play online",
 	"homeOffline": "Play offline",
 	"homeMe": "Me",
-	"homeLogout": "Logout"
+	"homeLogout": "Logout",
+	"loginWindowTitle": "Login",
+	"loginFormTitle": "Login",
+	"loginFormUsername": "Username",
+	"loginFormPassword": "Password",
+	"loginFormButton": "Login",
+	"loginNoAccount": "No account yet?",
+	"loginRegister": "Register",
+	"errorEmptyField": "This field may not be blank."
 }

frontend/static/js/lang/fr.json

@@ -11,5 +11,13 @@
 	"homeOnline": "Jouer en ligne",
 	"homeOffline": "Jouer hors ligne",
 	"homeMe": "Moi",
-	"homeLogout": "Déconnexion"
+	"homeLogout": "Déconnexion",
+	"loginWindowTitle": "Connexion",
+	"loginFormTitle": "Connexion",
+	"loginFormUsername": "Nom d'utilisateur",
+	"loginFormPassword": "Mot de passe",
+	"loginFormButton": "Connexion",
+	"loginNoAccount": "Pas de compte?",
+	"loginRegister": "S'inscrire",
+	"errorEmptyField": "Ce champ ne peut être vide."
 }