You can set the prompt language for a call flow.
To set the prompt language:
From the Actions menu on the call flow page, click Set Prompt Language.
A window with the list of available languages appears.
Select a language or accept "Auto" as the default value.
Note: Use "Auto" to take advantage of the Multilingual Service feature, whereby users are asked to select between up to five prompt languages when the Language Router action is performed.
Click OK. The selected language will be used for the call flow.
Note: Changes to the prompt language are not saved until you press the Save button.