Can't show commit detail for (german) Umlaute

[OlliGue]

Hi,

if a simple .txt file contains (german) Umlaute like äöüÄÖÜ or ß in the file content or in the file name, Ginatra is not able to show the commit detail of a commit. It displays then:
"500 Internal Server Error

Sorry, something went wrong."

The file encoding was tested with ANSI and UTF-8 (same problem with both).
If you click on the source, the file content of .txt files with Umlaute won't be shown directly (but as binary file download or raw possible).

(Umlaute in the commit comment itsself doesn't seem to make any problems.)

Thank you very much! Ginatra is great!