Steps to reproduce:
1. Add a form with the following fields and rule:
2. Publish the form;
3. Enter the link of the published form on another tab;
4. Change the page's viewing language to any other instance's available language, for example Portuguese, by adding "/pt" in the URL just before "/group";
5. Fill Operator 1 with any number;
6. Fill Operator 2 with any number;
7. Assert that Total shows the sum of them;
8. Submit the entry.
The entry should be submitted successfully.
An error message appears indicating that some validation failed.