Solution : https://service.sap.com/sap/support/notes/662293 (SAP Service marketplace login required)
Key words : 
filled attribute 'text lang, attribute 'text lang, support packages mentioned, filled incorrectly, type 'lang', lang-component, symptom tables, language dependent, unicode systems, terms iwadm
Related Notes : 
       
| 480671 | The Text Language Flag of LANG Fields |