Solution : https://service.sap.com/sap/support/notes/1074587 (SAP Service marketplace login required)
Key words : 
text type = short texttext    = alias   = uws_forms/conf_line1          uws_forms/conf_line2here, language package alias length text en  uws_forms uws_forms/conf_line1 50, en  uws_forms uws_forms/conf_line2 50, short text, import support package 14, import support package 4, call transaction sotr_edit, transaction sotr_edit, confirmation page, terms websurvey
Related Notes : 
       
| 1165341 | SURVEY: Confirmation when completing a questionnaire | 
| 1108501 | SURVEY: No confirmation page for ad hoc questionnaires | 
| 1078545 | SURVEY: Default user for BSP application (continuation) |