The way the function getConfigurationElement searches for the configuration-element is broken in any non-English HAss (as the element is not called "Configuration").
The easiest way to fix this is by searching for the attribute data-panel rather than string.
Thank you for the contribution! The 'new item' feature was made in a bit of a hurry, so I figured I missed something obvious. Thanks for catching the mistake
The way the function
getConfigurationElement
searches for the configuration-element is broken in any non-English HAss (as the element is not called "Configuration"). The easiest way to fix this is by searching for the attribute data-panel rather than string.