fix: label widgets hint, date default format issue

Author: raktima-opensignlabs

apps/OpenSign/src/components/pdf/Placeholder.js

@@ -74,7 +74,9 @@ function Placeholder(props) {
       const newDate = moment(milliseconds).format(dateFormat);
       const dateObj = {
         date: newDate,
-        format: dateFormat
+        format: props.pos?.options?.validation?.format
+          ? props.pos?.options?.validation?.format
+          : "MM/dd/YYYY"
       };
       setSelectDate(dateObj);
     }

apps/OpenSign/src/components/pdf/PlaceholderType.js

@@ -755,6 +755,7 @@ function PlaceholderType(props) {
     case "label":
       return (
         <textarea
+          placeholder="Enter label"
           rows={1}
           onChange={(e) => {
             onChangeInput(