[bugs] train, regionalisation

[stap-m]

Description of the issue

I spotted two bugs:

• regionalisation is a subclass of study factsheet, but should be (according to def) be a kind of methodology
• train is equivalent to land vehicle, but should be subclass of, instead.

Ideas of solution

If you already have ideas for the solution describe them here

Workflow checklist

• [ ] I am aware of the workflow for this repository

[nelekoehler]

I will create a PR for fixing the bugs.