Calendar page shows course events in the languages the teachers selected.

For ex.:

1. An English-speaker teacher create an assignment "Homework (1)" on the course "Math"
2. A Japanese-speaker teacher create an assignment "Homework (2)" on the course "Math"
3. A Chinese-speaker teacher create an assignment "Homework (3)" on the course "Math"
4. A Russian-speaker teacher create an assignment "Homework (4)" on the course "Math"
5. An Arabic-speaker teacher create an assignment "Homework (5)" on the course "Math"
6. The course calendar shows as attached.

My Moodle site (1500 users) has only 9 user-events with 4 users. 99.9% of events are course events.

A student on the course "Math" gets the list of due date in 5 languages, but he/she may not read such events.

It is not useful that event language depends on the teacher's preferred language. Translation for student's preferred language is useful.