I use the nodebb-plugin-night-mode to switch off the light but noticed that with the Cerulean Skin many buttons show with a glowing white background color which of course is not compatible with a dark mode theme (mod).
It works just fine with Cosmos and some others skins I tested. It is possible to get that fixed with Cerulean ? I think that skin just looks best on NodeBB.
@azeus looks like this plugin without localization,
You need change this file: