Solution : https://service.sap.com/sap/support/notes/40815 (SAP Service marketplace login required)
Key words : 
lang=<nameoflocale> strace datewhich shows file access return codes pointing, transaction se38 -> enter rscp_nls_check -> select documentation -> press display, operating system level verify correct install, unexpected locale dependent text processing behaviour, work process trace files dev_wn, ~ftp/general/r3server/abap/note, windows nt/2000/xp/7 amd - 64bit, lang=<nameoflocale> datewhich, windows nt/2000/xp ia - 64bit, work process trace file
Related Notes : 
       
| 860600 | IR01: Short text for few languages are not saved | 
| 679821 | Check of kernel compilation mode (Unicode/Non-Unicode) | 
| 407621 | INST: 4.6C SR2 R/3 Inst. on Windows 2000: IBM AS/400 | 
| 406692 | INST: 6.10 SAP Web AS Installation on IBM eServer iSeries | 
| 187864 | Linux: Locale Support on Linux | 
| 146289 | Parameter Recommendations for 64-Bit SAP Kernel | 
| 104385 | 500-599 reserved for batch processing | 
| 73606 | Supported Languages and Code Pages | 
| 54059 | Korean Installation Guide | 
| 47408 | Taiwanese R/3 | 
| 47036 | Chinese (Main land China) R/3 System | 
| 42781 | RABAX TEXTENV_... | 
| 40024 | Transferring customer files to sapserv# using ftp | 
| 39763 | setlocale on Windows/NT and table TCP0C | 
| 39745 | setlocale on ReliantUNIX (SINIX) and table TCP0C | 
| 39739 | setlocale on Solaris (SunOS) and table TCP0C | 
| 39718 | setlocale on AIX and table TCP0C | 
| 39473 | locale and TCP0C | 
| 39309 | setlocale on Digital UNIX (OSF/1) and table TCP0C | 
| 38677 | setlocale on HP-UX and table TCP0C | 
| 35313 | How to test character sets and codings ? | 
| 19466 | Downloading SAP kernel patches |