use <a href="https://de.wikipedia.org/wiki/Corona-Warn-App" class="extiw" title="de:Corona-Warn-App">Corona-Warn-App</a> in covid-19 pandemic
<a href="//commons.wikimedia.org/wiki/User:Mrmw" title="User:Mrmw">Mrmw</a>
<span class="int-own-work" lang="en">Own work</span>