Hello kwitt Unfotunately, These advance selections are not available in the platform for now.
But you can use the liquid to apple these conditions in the email content itself.
Here is what you can do in email with liquid.
For language:
{% if {{items[0].country}} contains 'fr' %} Do this {% else %} Do that {% endif %}
For start date:
{% assign today = 'now' | date: "%Y-%m-%d" %}
{% assign catalogStartDate= {{items[0].start_Date}} | date: "%Y-%m-%d" %}
{% if today==cataglogStartDate %} Do this {% else %} Do that {% endif %}