Solution : https://service.sap.com/sap/support/notes/320879 (SAP Service marketplace login required)
Key words :
goto -> header -> texts => language = logon language, additional key words va01 text, multiline text editor, logon language, text screen, text screens, output language, proposed language, language proposal, sd documents
Related Notes :
| 451147 | Text display not in the language of the sold-to party |
| 443011 | Header and item texts displayed in incorrect language |
| 442976 | Language proposal of header and item texts in SD |