[Django] deactivated strict_trans_tables break Django/Mysql setup

[nerdoc]

A Django setup seems to need strict_trans_tables in mysql. So if you setup Django on an Uberspace 7, and start the server, you get a warning.

you can prevent this by adding the sql_mode: traditional to the database options in your django setup:

DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.mysql',
        'OPTIONS': {
            'sql_mode': 'traditional',  # tolerate deactivated strict_trans_tables
        }
    }
}

Uberspace should add that to the Django setup guide in Uberspace lab.