[IMP] point_of_sale: replaced the dollar sign by a more international alternative

addons/point_of_sale/static/src/css/pos.css

@@ -543,7 +543,8 @@ td {
 .pos .actionpad .button.pay .fa {
     display: block;
     font-size: 32px;
-    line-height: 60px;
+    line-height: 54px;
+    padding-top: 6px;
     background: rgb(86, 86, 86);
     color: white;
     width: 60px;

addons/point_of_sale/static/src/xml/pos.xml

@@ -150,7 +150,7 @@
                 <i class='fa fa-user' /> Set Customer
             </button>
             <button class="button pay">
-                <i class='fa fa-dollar' /> Payment
+                <i class='fa fa-chevron-right' /> Payment
             </button>
         </div>
     </t>