Solution : https://service.sap.com/sap/support/notes/307818 (SAP Service marketplace login required)
Key words : 
note adds bw specific information, additional key words language import, execute report <z1>rsdg_language_after_import</>, solution d001749 / d020384  31, activated content objects, newly installed language, language transport technique, language import, language transport, completely converted
Related Notes : 
       
| 195443 | Current note on language import 4.6C |