Hi,
Do you have a data layer on your website? If you have a web analytics tool such as Adobe Analytics or Google Analytics on your website, you probably also have a data layer.
We normally store the language of the website in a data layer. We can grab this information from the data layer and send it to Adobe Target so it can be used as an Audience.
More information on how you can send parameters to the global mbox can be found here:
https://docs.adobe.com/content/help/en/target/using/implement-target/client-side/mbox-implement/glob...
This small piece of code can be put on your website with your tag manager.
You can then select this parameter when creating an audience. More info can be found here:
https://docs.adobe.com/content/help/en/target/using/audiences/create-audiences/categories-audiences/...
I hope this helps.
Kind regards,
Jonas