Error in errorhandler language test

[jamesjjk]

I have updated the test isLanguage key with the latest match from nodebb 9.x it seems to be wrong in the write API. Maybe can create a PR?

https://github.com/jamesjjk/nodebb-plugin-write-api

[julianlam]

It's now even scarier 😆

/\[\[\w+:[\w\.]+((?!\[\[).)*?\]\]/g...