added translations on login and detail page

src/assets/i18n/detail/en.json

@@ -0,0 +1,3 @@
+{
+  "congratulations": "Congratulations you discovered"
+}

src/assets/i18n/login/en.json

@@ -0,0 +1,8 @@
+{
+  "login": "Log-in",
+  "register": "Register",
+  "username": "username",
+  "password": "password",
+  "usernamePlaceholder": "insert username",
+  "passwordPlaceholder": "insert password"
+}