I am having the same issue, but display language is Chinese. I have removed all other display languages from the Advanced Settings, except for English.
The system region has always been United States. I see no options for region settings in the brave browser so I just tried removing all additional languages from the system. I’ll try uninstalling and reinstalling after I get my tabs saved. I thought brave sync was supposed to let me share tabs between pc and mobile but it’s never let me do that.