Industrial GetSimple website 100+ pages

[yojoe]

1. Is necessary? I can change them, but wanted to make them low contrast not to stick too much.

Way better.
But look at the links on the bottom of the page, and compare links in page's content to those on the bottom.
The size between them should differ them enough
Otherwise your main purpose of having a different colour is to place a visible accent to those link, not on page's content which contains such links.

2. #1 Fixed. Used the default colors of the menu. Is it still too harsh?

Remember a simple thing: if you develop a multilanguage page , let the visitors choose language they understand as fast as possible. If they can't find language switcher, they will close the page.

3. It is an animated gallery, not a slider.

Then expose this gallery as an animated gallery, rather than slider.
Try with thumbnails in links instead of gray dots.

That's all I'd put a bit more attention. Maybe more space between content containers, but it's not bat as it is right now.