You can import a new document along with its translations in one import job. To do this you need to use this file naming convention
groupid is an arbitrary identifier that will be used to match a new document with its translations. Just don't use the underscore character for this
Example, to import a set of localized pages in 3 languages, filenames should look like:
When importing a set of localized documents, a grouplang ID will be assigned to the documents. The groupland ID is useful if you need to import more translations in this group later on.