Hello,
I recently messed a bit with some actors of the game and I caused some problems.
Is there a way to reset them using the console?

I mean reset their stats, their spells etc...

Hm, I didn't know, what you did, but why don't simply look into Tes4Edit and remove the changes ?
Should be possible.

No my mod scripts cause that mess before i replaced those.
I was thinking something like "RESURRECT" but more specific.

If you want to reset the base actor use placeatme baseactorID .It will create a new version of the NPC as it was created in TESCS, then disable the old one.
Or you can set all actor values and inventory manually in the console but it is a lot of typing.