Block specific domain (qaru.site) from google search results

Question

recently I started seeing results from qaru.site in the first 10 search results in google. This is kinda annoying as I hate plagiarism and it's just machine translated questions from StackOverflow, e.g.

java jaxb simple parsing is requiring @XmlAccessorType(XmlAccessType.FIELD) annotation

and

http://qaru.site/questions/2080946/java-jaxb-simple-parsing-is-requiring-xmlaccessortypexmlaccesstypefield-annotation

So, I have two questions:

1. Is that legal at all? If not can we do something against that?
2. Can I somehow ban this domain at least from my search results?

Sry, if it should be in some other part of StackExchange, I was guiding by domain used in questions.