Fix syntax highlighting for short and Short types

[aj-m]

Resolves: #1259
Changes:

• keywords.txt: register short and Short keywords so they're correctly highlighted as datatypes.

Tests: I don't think they apply here, but it looks and runs right for me.

[catilac]

I don't believe that we currently support the Short datatype. Can you remove the Short keyword addition?

Everything else works.

As for Short: You are welcome to create an issue around supporting the Short class. It will take more effort than adding a keyword to keywords.txt

[aj-m]

Done. I assumed it made sense to add Short alongside short since it's a standard Java type is all.

[catilac]

Thank you so much @aj-m! That is a totally understandable assumption to make. Approved 🎉 🙌🏽

[catilac]

@all-contributors please add @aj-m for code

[allcontributors]

@catilac

@aj-m already contributed before to code