RAML is served with no Content-Type

[leonadler]

Gentics Mesh Version, operating system, or hardware.

• Mesh v0.9.11
• Linux
• Oracle JDK 8

Problem

/api/v1/raml provides no Content-Type header (and therefore no encoding).
Chrome wrongly assumes windows-1252.

Reproducer

• Start mesh locally
• Open chrome at http://localhost:8080/api/v1/raml
• Open the developer console (F11)
• Enter document.charset or document.characterSet

Expected: utf-8
Actual: windows-1252

Reproducer 2

• curl http://localhost:8080/api/v1/raml -D - -o /dev/null -s | grep 'Content-Type'

Expected: application/x-yaml; charset=utf-8 or text/yaml; charset=utf-8
Actual: <empty>