Verdone. Sure it's not a Speedwell? No matter, it's the same answer whatever they are.

we have that problem , i always think it looks nice when they come on bloom.

I know its annoying whenn it happens , but we get a ot of comments where we live about lovely it looks , and there is about 6 gardens in my road that have the violets in their front lawns

any of the feed and weed type lawn care products will sort it for you.