Solution : https://service.sap.com/sap/support/notes/103279 (SAP Service marketplace login required)
Key words : 
normal word processing systems, additional key words sapscript, iso-latin1 character set, sapscript pc editor, display asian fonts, sapscript line editor, iso-latin1, -iso-latin1, text editor, external component
Related Notes : 
       
| 435735 | SAPscript: Mojibake for line break in PC editor | 
| 417453 | PC editor: Systems with blended code page | 
| 165877 | SAPscript: Error in the PC editor when saving | 
| 128649 | Additional Info: Install/Upgrade Thai Version 40B |