Training only works if the people that you are training understand what you are trying to share with them. When it comes to health and safety procedures, you need to make sure that the message gets to your employees.
At several of the meat packing plants that had outbreaks last spring, the COVID procedure signage was only in English and not all of their employee population spoke/read English. The Smithfield plant that had over 783 COVID cases gave instructions to sick workers in English, despite the fact that 40 different languages were spoken by its employees. This issue also made the work difficult for epidemiologists and industrial hygienists who were trying to understand how the spread occurred.