style(metabox): fix create new button styling

Remove underline and add proper color to the create
new translation button in the metabox.

Author: apermo

assets/css/msls.css

@@ -24,6 +24,14 @@ select.msls-translations {
             input.msls_title, select {
                 flex-grow: 1;
             }
+            .msls-create-new {
+                text-decoration: none;
+                margin-left: 4px;
+                color: #2271b1;
+                &:hover {
+                    color: #135e96;
+                }
+            }
         }
 	}
 }