Expensive parser function calls

As an exercise I wanted to create a Dutch version of page http://wiki.openstreetmap.org/wiki/Category:Tag_descriptions_for_key_%22power_supply:schedule%22. After I inserted {{Languages}} I got message “Warning: This page contains too many expensive parser function calls. It should have less than 100 calls, there are now 131 calls.”, although the page is very simple. What is wrong?

I found the reason. Apparently there was a hidden {{languages}} template call. Together with the explicit one I added there were two, causing this error.