Solution : https://service.sap.com/sap/support/notes/421046 (SAP Service marketplace login required)
Key words : 
additional key words query, long texts, text fields, language table, text field, prerequisites error, support packages, symptom note 414813, correction instructions, note 414813
Related Notes : 
       
| 414813 | SAP query: Translated texts disappear | 
| 380304 | InfoSet Query: Performance improvements |