fix(EU): New models, convert location_last_updated_at to datetime

[ZuinigeRijder]

@cdnninja hyundai_kia_connect_monitor uses Property Vehicle.location_last_updated_at. A German Kona model 2024 user tried out the support of the new EU models (v3.13.0).

Property Vehicle.location_last_updated_at was not given back a datetime for the EU new models (e.g. Kia EV9, Hyundai Kona 2024 model) but a dictionary. Converted the dictionary to a datetime, like this is done for the other EU models.

Vehicle._location_last_set_time is now also converted to a datetime for the EU new models.

Other improvements:

• all the supported languages list are two-letters, so no distinguishing of e.g. en-gb or en-us, so just use the first two letters to avoid errors
• fixed style warning: comparison == False

[cdnninja]

Thanks for this! I think new models are getting much closer.