My workplace has standardised on en-GB, which unfortunately does put me at an advantage. But it’s realistically the only way it can work: there’s no chance that

My workplace has standardised on en-GB, which unfortunately does put me at an advantage. But it’s realistically the only way it can work: there’s no chance that globally every employee will learn sv-SE. So what can you do? Encourage your native speakers to simplify their language is a good first step. Stop using so many idioms that don’t directly translate, and pick more common words when more common words will do. Then make sure that English is a skill assessed in hiring. And as it’s a business requirement for reasonable English, make sure that training is available to those that want / need it. It doesn’t have to be English of course, the same advice would apply the other way around if you pick a different language. But you’ll probably find long-term hiring easier if you stick to a lingua franca.