Address validation using Google API

One-sentence description

Address validation using Google API

Why?

Currently, many people enter a home address when registering for Thalia as member, that's not correct. This data however can be validated. Tom Evers wrote a python script doing this for Thabloid address labels. It checks whether the postal code matches the other data.

Current implementation

People can enter invalid data.

Suggested implementation

People receive an error message when they enter data that cannot be validated.