Web UI: flask and werkzeug library version mismatch

[rdmark]

We've fixed the Flask library version to 2.2.2 but when pip resolves requirements on Ubuntu 22.04 we get werkzeug 3.0.0 which is incompatible with Flask 2.x.

Using werkzeug 2.2.3 fixes the problem (the final Flask 2.2 compatible version.)

https://flask.palletsprojects.com/en/3.0.x/changes/
https://werkzeug.palletsprojects.com/en/3.0.x/changes/

As a side note, Flask 3 and werkzeug 2.3 makes some major API changes, including deprecating werkzeug.urls (need to use urllib instead) and dropping support for Python 3.7.

[rdmark]

Hotfix in #1234

[rdmark]

Additionally, if bumping to Flask 3 we have to bump to flask-babel 4 as well. They are all interdependent, with the common goal of dropping support for Python 3.7.

However the flask-babel API has changed so it's not as easy as just bumping the lib version. At least the method to initialize the Babel app has changed from Babel(app) to babel.init_app(app, locale_selector=get_locale) while the @babel.localeselector decorator isn't used anymore.

https://stackoverflow.com/questions/75270265/attributeerror-babel-object-has-no-attribute-localeselector