Remove unused imports

invenio_config_tuw/forms.py

 # -*- coding: utf-8 -*-
 #
-# Copyright (C) 2020-2022 TU Wien.
+# Copyright (C) 2020-2023 TU Wien.
 #
 # Invenio-Config-TUW is free software; you can redistribute it and/or modify
 # it under the terms of the MIT License; see LICENSE file for more details.
 
 from datetime import datetime
 
-from flask import current_app, url_for
-from flask_babelex import gettext as _
+from flask import current_app
 from markupsafe import Markup
 from werkzeug.local import LocalProxy
 from wtforms import BooleanField, Form, HiddenField, validators