In English, capitalization is a rather easy task compared to French. Here is a good article:

https://www.grammarly.com/blog/capitalization-rules/

In terms of how things are capitalized in the Glossary entries, the general rule is the same as in French: capitalize the words like if they were in the middle of a sentence. Il will be up to the client code to capitalize the first letter if the words are used for a title. This is because only the client knows about the usage context.