Solution : https://service.sap.com/sap/support/notes/1052571 (SAP Service marketplace login required)
Key words : 
symptom wrong text reason, object dtel natsl solution, prerequisites incorrect finnish translation, corrected translation object, translation transaction se63, translation object, enter dtel, incorrect line, object type, enter object
Related Notes : 
       
| 585116 | Translation after installation of WebAS SP25 |