Interesting fact, one frequently asked engineering career question I receive is: “Which area should I focus on to succeed in software engineering?

As a manager who oversees multi-regional teams, why is English important in technology careers?
English is instrumental to succeeding in software engineering. In order to stay up-to-date with the latest technology, understanding and communicating well in one of the world’s most widely-used languages, English, is pivotal. 
Icaro adds that, from there, teams can focus on getting certifications, which are generally offered in English to help them to stay on top of industry regulations and in preparing knowledge-sharing presentations.
What advice do you have for other managers who have to communicate with and manage global teams?
Managing a global team in tech is no trivial task. From my experience, the biggest challenge in managing global teams is communication. Different countries have different ways of communicating. [Managers also have to be aware of varying cultural norms that can impact communication.] 
Also, having a global team requires understanding different accents as well. Besides this, another significant challenge in managing a global team is time zones that make communication even more difficult. 
So, I would strongly suggest to always over-communicate. Also, I would suggest to avoid having private conversations when making project decisions. You should document your thoughts publicly whenever possible. That approach helps all the team members have access to the same information always.
What career challenges did you face before mastering English? 
In tech, being up to date with the latest technology is not only required but also expected. Before mastering English, I used to wait until the content was translated into my mother language to access the latest trends, which usually takes months. So, I was always behind other engineers who had proficiency in English. 
Also, after I was able to receive access to the information, the information was no longer relevant or was replaced by a new technique, which put me even further behind the others who had access to this information first.