Add change text on receipt dialog

pages/pos.php

@@ -15,6 +15,7 @@
                 </button>
             </div>
             <div class="modal-body">
+                <div class="display-4"><?php lang("change"); ?>: $<span id="receiptchange">0.00</span></div>
                 <iframe class="w-100" id="receiptframe"></iframe>
             </div>
             <div class="modal-footer">

static/js/pos.js

@@ -45,6 +45,7 @@ function recalculate() {
     $("#paid-amount").text(paid.toFixed(2));
     $("#owed-amount").text(remaining.toFixed(2));
     $("#change-amount").text(change.toFixed(2));
+    $("#receiptchange").text(change.toFixed(2));
 }