Hi C.C.,
Localized language editions of MS Office may use the same
file names but with different content. Installing multiple
localized editions on a single operating system boot partition
isn't recommended.
For enterprise/corporate environments MS has a non-retail
multilanguage edition of MS Office.
http://microsoft.com/office/editions/prodinfo/language/choosing.mspx
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Would the application files conflicts with each other? Or cover each
other? --but what language version would cover the other? or in a order of
installing process? >>
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Let us know if this helped you,
Bob Buckland ?

MS Office System Products MVP
*Courtesy is not expensive and can pay big dividends*
Office 2003 Editions explained
http://www.microsoft.com/uk/office/editions.mspx