Each change that must be saved in the fifa.db or language database files is kept in memory until you save your work using the Save menu. The main database is always fifa.db but the language database used depends either on your choice or on an automatic selection using information from the Windows registry. Keep in mind that you work with only one language database at a time, the other language databases available on your PC, if any, remain unchanged.
An option can be set to prevent the accidental editing of the database.

CM automatically makes a backup copy of your database (fifa.db.bak and lan.db.bak) before saving, so you can recover the previous database if you need: remove the new fifa.db and rename fifa.db.bak to fifa.db and do the same with the language database.