set disabled reason in element title

Author: simonLeary42

webroot/panel/account.php

@@ -302,13 +302,16 @@ function enableOrDisableSubmitLoginShell() {
         var newLoginShell = getNewLoginShell();
         if (!isLoginShellValid(newLoginShell)) {
             $("#submitLoginShell").prop("disabled", true);
+            $("#submitLoginShell").prop("title", "Invalid Login Shell");
             return;
         }
         if (newLoginShell == ldapLoginShell) {
             $("#submitLoginShell").prop("disabled", true);
+            $("#submitLoginShell").prop("title", "Login Shell Unchanged");
             return;
         }
         $("#submitLoginShell").prop("disabled", false);
+        $("#submitLoginShell").prop("title", "Submit Login Shell");
     }
     $("#customLoginBox").on("input", enableOrDisableSubmitLoginShell);
     $("#loginSelector").change(enableOrDisableSubmitLoginShell);