<https://www.sbbic.org/2010/05/27/khmer-unicode-typing-trainer-for-windows/khmer-unicode-typing-3-654/#webpage>
<http://schema.org/inLanguage>
"en-US"
<https://www.sbbic.org/2010/05/27/khmer-unicode-typing-trainer-for-windows/khmer-unicode-typing-3-654/>