[Resuelto] translate the existing products from Bulgarian to English,

Background of the issue:
We are trying to translate the existing products from Bulgarian to English, but when we translate them, they fail to load in the front end. The backend part works without a problem, it can be edited there and everything loads correctly. This is one product that has been translated but failed to load: enlace oculto

Symptoms:
After a certain time, an Internal Server error appears when trying to load the translated products in the front end.

Questions:
Why do the translated products fail to load in the front end?
What causes the Internal Server error after translating the products?