From information gleamed from the AUGI Forums and Twitter earlier today...
The Update can be applied to all languages of Revit Architecture. Currently, only the English download page has the update, but the other language download pages will be available by the middle of next month. Until then users with other languages can download the update from the English page.
Please note, the update release does not contain any new functionality. However, we are developing functionality enhancements that will be available to Subscription customers in the near future. All of the fixes that are in Updates 1 & 2 will be included in the functionality enhancement release, so if you need to update a large number of seats it may be best to wait until it is released unless there is a fix that you absolutly must have.
Thanks Scott for the update