Resolve "Add some state tests"

Closes #44 (closed)

assets/translations/en.json

@@ -9,6 +9,9 @@
   "settings_title": "Settings",
   "settings_label_api_url": "API URL:",
   "settings_label_security_token": "Security token:",
+  "settings_label_interface_type": "Interface type:",
+  "interface_type_basic": "basic",
+  "interface_type_expert": "expert",
   "settings_button_save": "Save",
 
   "about_title": "About",