Adding Eng strings

Author: IvayloG

HTMLSamples/editors/strings-en.json

@@ -3,6 +3,9 @@
   "constraints": "Date Contraints, Hide Input Mask",
   "Control_Name": "Control Name",
   "date_config": "Date and Time Configuration",
+  "Date_Object":"Date object",
+  "Display_Mode_Text":"Display mode text",
+  "Edit_Mode_Text":"Edit mode text",
   "DatePickers_submited_values": "DatePickers submitted values",
   "default_config": "Default Configuration",
   "End_Date": "End Date",