Translation for Confluence has two different translation modes. Each mode is explained further below.
Create new page
With the "Create new page" mode activation of new languages will create spaces that are unique for that language. Translating a page in this mode will create a translated page in the space that corresponds to the language selected.
...
Instant Translation
With the "Instant Translation" mode the data inside the page is translated instantly on the same page. Users can choose the desired language via a dropdown on the page that needs to be translated. 
...