Adding Validation Controls for hostname and validation message for email

src/opnsense/mvc/app/models/OPNsense/Proxy/Proxy.xml

@@ -71,11 +71,14 @@
             </suppressVersion>
             <VisibleEmail type="EmailField">
                 <default>admin@localhost</default>
+                <ValidationMessage>Please enter a valid email address</ValidationMessage>
                 <Required>N</Required>
             </VisibleEmail>
             <VisibleHostname type="TextField">
                 <default>localhost</default>
                 <Required>N</Required>
+                <mask>/^([0-9a-zA-Z.,_\-]){0,1024}$/u</mask>
+                <ValidationMessage>Please enter a valid servername, ip address or leave this option blank</ValidationMessage>
             </VisibleHostname>
             <cache>
                 <local>