Linting warnings disappears

[TimotheeVille]

Given multiple editors are opened on the same page
And have warnings
When I change the content in an editor
Then warnings of other editors disappear

[karamosky]

I made a pull request to react-ace to accept a mode as an object. This will allow us to use instance scoped modes for i18n.
And will allow us to fix the linters that are using the global languages