[Closed] translate the existing products from Bulgarian to English

Background of the issue:
We are trying to translate the existing products from Bulgarian to English using WPML. The backend part works without a problem, it can be edited there and everything loads correctly.

Symptoms:
When we translate the products, they fail to load on the front end. After a certain time, an Internal Server error appears. This is one product that has been translated but failed to load: hidden link

Questions:
Why do translated products fail to load on the front end?
What causes the Internal Server error after translating products?
How can we ensure that translated products load correctly on the front end?