Solution : https://service.sap.com/sap/support/notes/118673 (SAP Service marketplace login required)
Key words :
additional key words tcp00, initialization code pages failed, mandatory sap basis table, 1000 small sap tables, symptom message textenv_codepage_not_allowed, sql statement finds, important code pages, manual database copies, log r19=>tsk_init, select statement displays
Related Notes :
83196 | TEXTENV_CODEPAGE_ / _LANGUAGE_NOT_ALLOWED |
44788 | How character sets are set up |