Hi there, @syliergonz.

Thank you for posting here in the Community. I'm here to help change the language in QuickBooks Online (QBO).

You can change the language in QBO under the Account and Settings. However, this is only available in the international versions of QuickBooks.

1. Go to the Gear icon.
2. Select Account and Settings.
3. Click Advanced.
4. Go to Language and click the small Pencil icon.
5. Click the drop-down and choose the language.
6. Click Save.

Feel free to visit the Community space if you have any other questions, I'm always here to help. Have a good day!