Use the Install additional languages... option to install more Language Packs from the Marketplace, or select a different locale from the list. Changing the locale requires a restart of VS Code. You will be prompted to restart when you select a locale.The Configure Display Language command writes to the Runtime Configuration Arguments file argv.json in your user VS Code folder (.vscode).The locale can also be changed by editing the argv.json file directly (Preferences: Configure Runtime Arguments) and restarting VS Code.