500 Internal Server Error when downloading specific maps

[MinesaeHiromu]

A handful of maps cannot be downloaded and only lead to a (500) Internal Server Error page:

Patreksfjörður - https://resource.openra.net/maps/44335/
Siglufjörður - https://resource.openra.net/maps/43985/
Montélimar - https://resource.openra.net/maps/43768/
Béziers - https://resource.openra.net/maps/43632/

Seems to be due to the diacritical marked characters in the file name?

My Firefox console gives this error message when opening the download pages:
"The character encoding of the HTML document was not declared. The document will render with garbled text in some browser configurations if the document contains characters from outside the US-ASCII range. The character encoding of the page must be declared in the document or in the transfer protocol."