To hide or show an Oxygen element based on the language (using Translatepress) you need to set a simple PHP Return Function. This tip is from the Facebook group: https://www.facebook.com/groups/wpdevdesign/permalink/3188494754586784/

And here is the function:

conditions > dynamic data > php function return value > get_locale > "de_DE", "en_GB" , ...

Manuel Mochkal