Solution : https://service.sap.com/sap/support/notes/1013433 (SAP Service marketplace login required)
Key words : 
correct language key usage, 'cascading fonts' usage, correct language key, involved font family, terms smart forms, 'cascading fonts' solution, japan language key, unicode device type, language key, andale_x fonts
Related Notes : 
       
| 1319517 | Unicode Collection Note | 
| 812821 | Cascading Font settings |