C# Code Fence - Inconsistent Highlighting

[Foxtrek64]

Describe the bug
According to the PrismJS website, the valid "languages" for C# code are csharp, cs, and dotnet. When editing a markdown file with a cs or dotnet codeblock, syntax highlighting is not applied.

To Reproduce
Steps to reproduce the behavior:

1. Create a new markdown file.
2. Add a code fence with the language as cs.
3. Add some valid content to the code fence.
4. Notice how syntax highlighting is not applied.
5. Change code fence language to csharp.
6. Notice how syntax highlighting applies.

Expected behavior
Using any of csharp, cs, or dotnet should result in the same syntax highlighting.

Screenshots
cs

csharp

dotnet