If a vendor requests the Submission Instructions in a language other than English, you can create one by first changing the language of your portal (currently the available languages include French, Russian, Portuguese and Spanish).
Once your project has been created, access Settings by clicking on the chevron in the top right corner.
Then navigate to the Preferred Language section in the left sidebar, clicking Save to confirm your new language choice:
Once the language has been changed, you can now go back to your project's Project Details page and click the equivalent of Actions -> Submission Instructions to retrieve the instructions in the new language (in the screenshot below, the example is in French):
Once you download the Submission Instructions in the subsequent popup, the document should be in displayed in the language you chose: