Correct implementation to reflect OASIS standard

[tschmidtb51]

We need to check what needs to be done to get conformance with the latest version of the standard which is at: https://docs.oasis-open.org/csaf/csaf/v2.0/csaf-v2.0.html

[tschmidtb51]

Some Todos:

• Use correct values for profiles for /document/category
• Implement Implement Language conversion #84

[tschmidtb51]

Use correct values for profiles for /document/category

Nothing to do here - it is just taken from CVRF 'as is'.

[bernhardreiter]

This is a task @bernhard-herzog can look into.

[bernhardreiter]

As #84 is done, next would be the check to identify other things that are not implemented and not yet open as issues.