Solution : https://service.sap.com/sap/support/notes/758011 (SAP Service marketplace login required)
Key words :
parameter zcsa/system_language overwrites, existing sap gui sessions, sap shortcut command line, su01 -> defaults -> logon language, terms sap shortcut, sap shortcut file, default logon language, logon language defined, default system language, default user language
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