Methods of customizing language settings
You configure language settings by using one of the following methods:
Office Customization Tool (OCT)
Language Settings tool
Use policies to enforce language settings
Policies enforce default language settings. Users in your organization cannot permanently modify settings managed by policy. The settings are reapplied every time that the user logs on.
To use policies to manage language settings
1.Copy the 2007 Office system policy template files to your computer.
2.Under Computer Configuration or User Configuration in the console tree, right-click Administrative Templates.
3.Click Add/Remove Templates and then click Add.
4.In the Policy Templates dialog box, click the template that you want to add and then click Open.
5.After you add the templates that you want, click Close.
6.Open the Group Policy object (GPO) for which you want to set policy.
7.Double-click Computer Configuration or User Configuration and expand the tree under Administrative Templates.
8.Locate language-related policies in the Microsoft Office 2007 system\Language Settings node.
9.Select the languages that you want to use for each setting.
10.Save the GPO.
The following policies help you manage language settings in the 2007 Office system:
Display menus and dialog boxes in Located in the Display Language folder. Determines the language of the user interface.
Display help in Located in the Display Language folder. Determines the language of online Help. If this policy is not configured, the Help language uses the user interface language.
Enabled Editing Languages Located in the Editing Languages folder. Enables editing languages from the list of languages supported by Office.
Primary Editing Language Located in the Enabled Editing Languages folder. Specifies the language in which users work with Office applications and documents when more than one language version is available on the computer.
For more information about settings policies for the 2007 Office system, see Enforce settings by using Group Policy in the 2007 Office system.
Use a Setup customization file to specify default language settings
You use the OCT to create a Setup customization file (MSP file) that Setup applies during the installation. Settings specified in the OCT are the default settings. Users can modify the settings after the installation.
To use the OCT to customize language settings
1.Start the OCT by running Setup with the /admin command-line option.
2.On the Modify User Settings page, expand the tree to Microsoft Office 2007 system\Language Settings.
3.Open the folder that you want in the left pane. Double-click the setting in the right pane, select Enable, and specify a value.
4.Save the Setup customization file in the Updates folder at the root of the network installation point.
Setup applies the file automatically when you install Office on users’ computers.
For more information about how to use the OCT, see Office Customization Tool in the 2007 Office system.
Use the Language Settings tool to modify language settings
If you are not enforcing language settings by policy, users who work in Office applications can use the Language Settings tool to change their language settings.
To change language settings by using the Language Settings tool
1.On the Start menu, point to Programs, point to Microsoft Office, and point to Microsoft Office Tools.
2.Click Microsoft Office 2007 Language Settings.
3.Click the Display Language tab.
This tab is available only when more than one language version is installed on the computer.
4.In the Display menus and dialogs in box, select the user interface language.
5.In the Display Help in box, select a language for online Help.
6.If you do not specify a language for Help, the online Help language uses the user interface language.
7.Click the Editing Languages tab.
8.Select the language that you want to be available for editing and then click the Add button. Repeat this step for each editing language that you want to add.
9.In the Primary editing language box, select the language in which you will most often work with Office applications and documents.
Refer to: http://technet.microsoft.com/en-us/library/cc179091(office.12).aspx