Solution manager requires Microsoft office products use language ENGLISH

In config guide for Solman SP6 section 3.1.2, there is a requirement that MS office products must have language setting EN.

Many of our customers use their own MS Office products with other language settings than EN.

Is this really a requirement or what happens if any user does not have language setting EN active in her/his MS office product? Which services in SolMan does not work anymore?

br: Kimmo