Add 3rd party L4 grammar to Supported Languages (#4282)

Author: serrynaimo

CHANGES.md

@@ -11,6 +11,7 @@ New Grammars:
 - added 3rd party Prisma grammar to SUPPORTED_LANGUAGES [SungHyun Kim][]
 - added 3rd party Magik grammar to SUPPORTED_LANGUAGES [Sebastiaan Speck][]
 - added 3rd party Gleam grammar to SUPPORTED_LANGUAGES [Filip Hoffmann][]
+- added 3rd party L4 grammar to SUPPORTED_LANGUAGES [Thomas Gorissen][]
 - added 3rd party Bicep grammar to SUPPORTED_LANGUAGES [Anthony Martin][]
 
 Core Grammars:
@@ -49,9 +50,11 @@ CONTRIBUTORS
 [Filip Hoffmann]: https://github.com/folospior
 [Twineee1]: https://github.com/Twineee1
 [hbgl]: https://github.com/hbgl
+[Thomas Gorissen]: https://github.com/serrynaimo
 [te-ing]: https://github.com/te-ing
 [Anthony Martin]: https://github.com/anthony-c-martin
 
+
 ## Version 11.11.1
 
 - Fixes regression with Rust grammar.

SUPPORTED_LANGUAGES.md

@@ -124,6 +124,7 @@ The table below shows the full list of languages (and corresponding classes/alia
 | Julia                   | julia, jl               |         |
 | Julia REPL              | julia-repl             |         |
 | Kotlin                  | kotlin, kt             |         |
+| L4                      | l4, legal              | [highlightjs-l4](https://github.com/legalese/highlightjs-l4)
 | Lang                    |                        | [highlightjs-lang](https://github.com/highlightjs/highlightjs-lang)
 | Lasso                   | lasso, ls, lassoscript |         |
 | LaTeX                   | tex                    |         |