Applications: Office/Visio/Project 2007 Language Packs

The previous entry was very simple. The language packs are a bit harder.
These require custom .xml files that you have to create yourself.

For office, the file for the French language pack looks like this:

<Configuration Product="OMUI.fr-fr">
<Display Level="none" CompletionNotice="No" SuppressModal="Yes" AcceptEula="Yes" />
<AddLanguage Id="fr-fr" ShellTransform="Yes" />
<OptionState Id="OfficeMUI" State="Local" Children="force" />
</Configuration>

For Visio & Project, change where needed.
For Project, change the file to:
<Configuration Product="PMUI.fr-fr">
<Display Level="none" CompletionNotice="No" SuppressModal="Yes" AcceptEula="Yes" />
<AddLanguage Id="fr-fr" ShellTransform="Yes" />
<OptionState Id="ProjectMUI" State="Local" Children="force" />
</Configuration>
Visio:
<Configuration Product="VisMUI.fr-fr">

<Display Level="none" CompletionNotice="No" SuppressModal="Yes" AcceptEula="Yes" />

<AddLanguage Id="fr-fr" ShellTransform="Yes" />

<OptionState Id="VisioMUI" State="Local" Children="force" />
</Configuration>

For other languages, change every fr-fr to the correct language. You can find these easily in your installation folder should you not know them by heart.
Now, put these .xml files in the folder where your Office Language Pack setup.exe is and run the following command for unattended installation of these language packs:
"setup.exe /config config.xml"