Change from groovy to charp in codemirror configuration

[froque]

### Submitter checklist
- [x] Make sure you are opening from a **topic/feature/bugfix branch** (right side) and not your main branch!
- [x] Ensure that the pull request title represents the desired changelog entry
- [x] Please describe what you did
- [ ] ~~Link to relevant issues in GitHub or Jira~~
- [ ] ~~Link to relevant pull requests, esp. upstream and downstream changes~~
- [ ] ~~Ensure you have provided tests - that demonstrates feature works or fixes the issue~~