Recently one of our customers wanted to add a language to an existing Microsoft Office deployment.
The procedure to add a language is well described in this article: https://technet.microsoft.com/en-us/library/cc179145.aspx
If you have already deployed Office, you should check the section “Modify and existing installation”.
If you follow the steps in this article, you will be able to deploy the extra language silently.
However, there are a few caveats:
1) You have to use the setup.exe located in the existing Office share. If you use the setup.exe that’s in the language pack you downloaded, it won’t work.
2) The config.xml you create, has to be placed in the root of the directory where you have extracted the Language Pack zipfile.
Here’s an example of a config.xml where we add the Spanish language. ”en-us” is set as the default language.
3) To suppress the dialog boxes, we’ve added this line in the config.xml: