Microsoft Office stores proofing tools and user interface components for each language separately. When you install only the English-language user interface, as is the case by default, all Office files related to displaying the user interface, including Help files, localized templates and wizards, and default AutoCorrect lists, are stored in the \Program Files\Microsoft Office\Office11\1033 folder. Grammar-checking files are stored in the \Program Files\Common Files\Microsoft Shared\Proof\1033 folder.
The number 1033 is the locale ID Microsoft has assigned to the U.S. version of the English language. In the default installation, Microsoft also creates corresponding empty folders named 3082 and 1036 where Spanish and French files will be installed if you use them.
Other languages are placed in folders that use their assigned locale names when you install proofing tools or user interface components with either the Microsoft Office Proofing Tools Kit or the Microsoft Office Multilingual User Interface Pack.