Merge branch '1051410_FixOrderLanguage' into '2020.1.0'

[Projekt: Entwicklung - Neon][TicketNr.: 1051410][Sprache wird beim Beleg nicht gespeichert]

See merge request xrm/basic!197

entity/Order_entity/entityfields/isolanguage/valueProcess.js

-import("system.neon");
 import("system.result");
 import("system.vars");
-import("KeywordRegistry_basic");
 
-if (vars.exists("$param.OrderLanguage_param") && vars.get("$param.OrderLanguage_param")) 
+if ((vars.get("$this.value") == null || vars.get("$this.value") == undefined) 
+    && vars.exists("$param.OrderLanguage_param") && vars.get("$param.OrderLanguage_param")) 
 {
     result.string(vars.get("$param.OrderLanguage_param"));
 }