This (working with multiple folks from multiple linguistic backgrounds) has been the story of my career.
It's unavoidable, and a cost of doing business internationally.
IMO the personal conflicts you describe that arise in your situation aren't from the language challenges, it's from the company culture. Figure out how to extend those olive branches, be kind amd understanding to eachother, take the time to really connect and respect eachother and those problems will go away. In short, it's not a language problem but a culture/attitude problem. I've worked in teams like this that work well with minimal conflict, and ones that have lots of conflict. Both had the same language challenges, that's not the variable that's different between the two, its company culture and attitude.
It's unavoidable, and a cost of doing business internationally.
IMO the personal conflicts you describe that arise in your situation aren't from the language challenges, it's from the company culture. Figure out how to extend those olive branches, be kind amd understanding to eachother, take the time to really connect and respect eachother and those problems will go away. In short, it's not a language problem but a culture/attitude problem. I've worked in teams like this that work well with minimal conflict, and ones that have lots of conflict. Both had the same language challenges, that's not the variable that's different between the two, its company culture and attitude.