Your sentences are mostly correct, well done. "Writing emails in English is very common at my company." The word universal is more generally used to describe something that is the same for groups larger than a company, like a country, the world, or a condition of the human experience. The word 'common' sounds more natural for your usage here. "I'm planning a trip across Europe that will end in Germany." "I will not be in my office at that time, so could you leave it with our gatekeeper? "We are not satisfied with your performance recently." "By cooperating, you can learn a lot of from one another. Also, you can share your experiences."

- Writing E-mail in English is very universal at my company. -- probably better emails? - I'm planning a trip across Europe with a final destination in Germany. - By that time I will not have been in my office, so could you leave it to our gatekeeper? - Google is the best search engine. It's undisputed. - He can't speak another language. He is monolingual. - We are not satisfied with your performance done recently. - By cooperating you can learn a lot from each another. You can share your experiences as well. - I've heard this joke many times, nevertheless, I still find it pretty funny.