This covers how to translate the titles of reports. Since this behavior is not there OOB you will need to change some dictionary settings.
- Navigate to System Definition > Dictionary
- Find and open the dictionary record where table = sys_report and column name = title.
- Change the Field Type to Translated Text and save the record.
- Follow the steps in our Documentation on updating a translated field to add the new values to the report titles you would like to translate.