How to add custom wordlist to KHangman?

Hi there,
I created my own wordlist for khangman. As my words are German, my file is/usr/share/apps/kvtml/de/foobar.kvtml and looks like this:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE kvtml PUBLIC "kvtml2.dtd" "http://edu.kde.org/kvtml/kvtml2.dtd">
<kvtml version="2.0">
  <information>
    <generator>converter</generator>
    <title>Statistik</title>
    <comment>Statistik</comment>
  </information>
  <identifiers>
    <identifier id="0">
      <locale>de</locale>
    </identifier>
  </identifiers>
  <entries>
    <entry id="0" >
      <inactive>false</inactive>
      <inquery>false</inquery>
      <translation id="0" >
        <text>Standardabweichung</text>
        <comment>Wurzel aus der Varianz</comment>
      </translation>
    </entry>

(...)
</entries>

</kvtml>

However, when I start up KHangman, my file is not in list…
How would I add a custom word list to KHangman?

hmm… I opened an issue here: 494254 – KHangman does not get custom word list