How can I set the recurrence of a task for every Monday, Tuesday, Wednesday and Thursday?
You can do that by setting the task's due date to "every Mon, Tue, Wed, Thu".
Please note that this only works in English. Non-English due dates only support no more than 2 days of the week at once.
There is predicting when this problem with another languages will be resolved?
Unfortunately, we're currently not planning to support this feature at this time.