If I understand it correctly you want to publish a page from MS Office, and you want to publish in a different language than the default, in which it already exists? Can you please clarify a bit.
Office publishing does currently not support updating an existing page or creating a new language version of an existing page. So if you want to create a new language version of the page you need to do this in edit mode.
EPiServer Development Team
I'm trying to get a translation of a page which already exists in the default language published from office. I set the language in How do I get Episerver to understand this is a new language version of an existing page?
Thanks and kind regards,