@Guillaume Rongier 
Thank you for your idea.

We got several comments on this idea here and on the Ideas Portal.

We discussed this idea with developers to estimate the resources needed.

We got 3 votes supporting this idea, and based on poll results 56% of users answered that they'll not use the Dark version.

Based on this input we move this idea to the status "Future consideration". We'll discuss the Dark version again during Community portal development planning.