Make English headlines consistent in upper / lower style

[StefanZoerner]

In the English table of contents, the headings are inconsistent with respect to upper and lower case.
Example from the start:

Legal Notice
List of Learning Goals
Introduction
What does a Foundation Level training convey?
Out of scope
Prerequisites
Structure, duration and teaching methods

I did a little research, and learned that there are no binding rules, but there are styles. In the press, for example, Up-Stype and Down-Style (depending on the newspaper).
https://www.dailywritingtips.com/up-style-and-down-style/

In the Advanced WG we had the same issue, and opted for Up-Style.

However, hardly any curricula have been adapted to this in our department. We only have a look at new and revised curricula.

[gernotstarke]

@alxlo decides capitalization

[gernotstarke]

Ok - then we follow the Advanced Level and go for an Up-style:

• uppercase for all substantives and verbs
• prepositions, articles may remain lowercase

[gernotstarke]

all changes in uppercase for headings go into the branch #246-Up-style-for-headings

[gernotstarke]

who wants to do similar things, should install this VS-Code extension:
https://marketplace.visualstudio.com/items?itemName=viablelab.capitalize

[martinweck]

Hi @StefanZoerner , hi @gernotstarke ,

I have just found your ticket. I suggest the following pull request: #345. So I simply looked how the text has been written right now and derived from that a hopefully consistent suggestion. Feel free to give comments in the pull request if you prefer another approach.