I used to work for a company that writes and administers these tests. This company broke the cardinal rule.
#1 - Only give personality tests in their native language.
This is unacceptable, a personality test is NOT a language aptitude test.
Personality tests will have questions like this:
True or False I am happy when others are taking advantage of me.
Non-native speakers may not appreciate that "taking advantage" is a negative term and might read it as "I am happy when others are taking advantage of my abilities". Hell I WORKED for the company and had to double-triple take some of the questions.
Some of these personality tests are even written for English / UK-English because of the nuances involved.