Solution : https://service.sap.com/sap/support/notes/143050 (SAP Service marketplace login required)
Key words : 
symptom general problems, character set cache, incorrect messages textenv_codepage_not_allowed, entry syslog e14, syslog e14, time starts, buffer rscpccc, database load, terms textenv_codepage_not_allowedrscpmi, prerequisites error
Related Notes : 
       
| 164545 | rare cases TEXTENV_CODEPAGE_NOT_ALLOWED (2,3) | 
| 83196 | TEXTENV_CODEPAGE_ / _LANGUAGE_NOT_ALLOWED |