If letters åäö or ÅÄÖ (used e.g. in Swedish, German etc) appear in an identifier the coloring breaks:

It works for Java though using the built in java syntax package:

Tested in vscode v1.23.1 using vscode-scala-syntax v0.1.2
The bug only appears in some color themes, e.g. Dark+ (default dark) and Monokai Dimmed. Above images grabbed with color theme Atom One Dark.