Add stamp, fix html, change accepts

src/main/resources/templates/security/get-info-on-pdf.html

@@ -16,7 +16,7 @@
 						<form id="pdfInfoForm" method="post" enctype="multipart/form-data"
 							th:action="@{api/v1/security/get-info-on-pdf}">
 							<div
-								th:replace="~{fragments/common :: fileSelector(name='fileInput', multiple=false, remoteCall='false')}"></div>
+								th:replace="~{fragments/common :: fileSelector(name='fileInput', multiple=false, remoteCall='false', accept='application/pdf')}"></div>
 							<br>
 							<button type="submit" id="submitBtn" class="btn btn-primary"
 								th:text="#{getPdfInfo.submit}"></button>