You can obtain the current page language tag via:
content.language.languageTag
This will output something like ‘en’, ‘en-us’, ‘de’, ‘fr’, etc.
To make a conditional for it, you simply need to put it in an if statement like so:
{% if content.language.languageTag == 'en' %}
{% cta guid="{{ module.en_cta_field }}" %}
{% elif content.language.languageTag == 'fr' %}
{% cta guid="{{ module.fr_cta_field }}" %}
{% endif %}
So in your module, you just need to create the corresponding CTAs for each language and make conditionals for it to show on the right pages.