[xliff] Note on the Charter

To follow up on the charter discussion: By "support aspects of the
internationalization process" we meant the part of internationalization
pertaining to localization ('localizibility' as the W3C call it).

Maybe a simple rewording could make it clearer:

Current: "The vocabularies will be tool-independent, and support aspects of
the internationalization process and the entire localization process."

Proposed: "The vocabularies will be tool-independent, and support the
localization-related aspects of the internationalization process and the
entire localization process."

-yves