Backport #21734
fixes: https://github.com/go-gitea/gitea/issues/21733
Uncaught Error: Language id "vs.editor.nullLanguage" is not configured
nor known
Note that this monaco-editor worked fine on 0.33.0 and broke on 0.34.0.
If upstream fixed, remove this code.
Signed-off-by: Xinyu Zhou <i@sourcehut.net>
Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>