These links provide the Service Pack 1 updates for Office 2013 Language Packs, which often act as a bridge for adding language support:
Log into your Microsoft Account and download the entire Office 2013 installer in the specific language you need. This will install the proofing tools and interface for that language alongside your current setup. 4. Important Considerations microsoft office 2013 language pack direct link top
Proofing Tools Only: If you only need to spell-check a document in a different language without changing the menus, this is the smallest and fastest download. The Challenge of Direct Download Links These links provide the Service Pack 1 updates