deprecated and replace attributes: needed-->required, blur-->placeholder in preprocessor

remove client-side code for them and enable translation of placeholder

api/js/etemplate/Et2InputWidget/Et2InputWidget.ts

@@ -82,6 +82,20 @@ const Et2InputWidgetMixin = (superclass) =>
 			};
 		}
 
+		/**
+		 * List of properties that get translated
+		 * Done separately to not interfere with properties - if we re-define label property,
+		 * labels go missing.
+		 * @returns object
+		 */
+		static get translate()
+		{
+			return {
+				...super.translate,
+				placeholder: true,
+			}
+		}
+
 		/**
 		 * Compatibility for deprecated name "needed"
 		 *

api/js/etemplate/Et2Widget/Et2Widget.ts

@@ -1243,7 +1243,6 @@ export function loadWebComponent(_nodeName : string, _template_node, parent : Et
  */
 function transformAttributes(widget, mgr : et2_arrayMgr, attributes)
 {
-
 	const widget_class = window.customElements.get(widget.localName);
 
 	// Apply any set attributes - widget will do its own coercion
@@ -1251,24 +1250,12 @@ function transformAttributes(widget, mgr : et2_arrayMgr, attributes)
 	{
 		let attrValue = attributes[attribute];
 
-		// If there is not attribute set, ignore it.  Widget sets its own default.
+		// If there is no attribute set, ignore it.  Widget sets its own default.
 		if(typeof attrValue === "undefined")
 		{
 			continue;
 		}
 
-		// "needed" is deprecated, use "required"
-		if(attribute == "needed")
-		{
-			attribute = "required";
-		}
-		// Skip these ones
-		// options is legacy / read-only
-		if(["options"].indexOf(attribute) > -1)
-		{
-			continue;
-		}
-
 		const property = widget_class.getPropertyOptions(attribute);
 
 		switch(typeof property === "object" ? property.type : property)