Hi,
You can very likely clear the page cache via the plugin options, that you are using for caching. Then refreshing the browser via the CTRL + R buttons a few times also helps.
Okay, I see what you want now. That is almos perfect, but it needs to be prefixed, this will work there:
If you want it in the title field:
{titlefield}: {__tax_product_cat}
If you want it in the description/content field:
{descriptionfield} {__tax_product_cat}