One issue though...
Windows Server 2012 R2 U1 x64 de-DE
When Calculor is started it "greets" you with a message box:
Sorry, Bub, the colour file list does not exist
Apart from that, a feature request:
The input box should be capable of displaying unicode characters.
E.g. when you use $n and paste a chinese character into the box you'll see only a "..."
Not very informative what you've actually inserted