RTC client doesn't change the language completely

For some reason, the RTC client doesn’t change the language completely. If we choose Dutch, the RTC restarts, and the interface is Dutch, but most of the items is still English. We still have “Financial Management” and “General Ledger” and so on… However, the buttons in the lower left corner are Dutch (Departments = Afdelingen) and most of the Interface itself is Dutch.

Anybody?