locale query parameter ignored on Embedded Sender View (createSenderView)

We're using the EnvelopeViews: createSender endpoint to embed the tagger/sender view in our application. We need to control the display language of the embedded sender view based on the user's account language.

Following the documentation, we append the locale query parameter to the URL returned by the API: https://app.docusign.com/...?locale=de

This approach works correctly for the recipient view (createRecipientView) — the signing UI displays in the expected language.

However, for the sender view (createSenderView), the locale parameter appears to be ignored entirely. The UI always displays in English regardless of the locale value.

Our setup:

• Using the new API format with EnvelopeViewRequest (settings object with startingScreen: "Tagger", sendButtonAction: "redirect", etc.)
• The locale parameter is appended as a query parameter to the returned URL (e.g., &locale=de)
• Tested with multiple locale values (de, fr, etc.) — none take effect

What we've verified:

• The URL does contain the correct locale parameter
• The same approach works for createRecipientView

Question: Is the locale query parameter supported for the embedded sender view? If not, what is the recommended way to control the display language of the embedded sender/tagger view?