In what order does one update when including Language Packs? With Service Packs? With Cumulative Updates? It used to be confusing. Now with 2010 it is straightforward.
Get the language packs:http://www.microsoft.com/download/en/details.aspx?displaylang=en&id=3411
now update your farm as desired.
1- SP SharePoint Server2- Language packs3- CU SharePoint Server4- PS Config (on every box)
NOTE: if you go and add a new language pack afterwards, you must reapply the CU as it may include updates for that language pack. (and rerun PSconfig again, of course)