Consistency for all text: add classes and id's for themes

If you change the text family to one of your liking inside a custom theme within HA, there are tons of places where this new font isn’t used.
It doesn’t have anything todo with caches, as clearing the cache doesn’t solve it.

I would love to see a consistent presentation of the front end of HA. Right now, the way things are being presented isn’t consistent at all, due to variations of presentation titles (different sizes), entities (bold vs not bold), text (some keep using the default font Roboto, even if you use a custom font, defined inside your custom theme).

Would love to help on this, but rather unsure where to start…