.group-product li.group-product_after {
  display: flex;
  align-items: center;
}
.group-product li.group-product_after::after {
  content: '،';
  display: inline-block;
  margin: 0 5px;
  vertical-align: middle;
}

.group-product li:last-child.group-product_after::after {
  display: none;
}