Now that the setup in configure.ac have been cleaned, moved the original
documentation from the 'INSTALL-WMAKER' file into the dedicated doc
'README.i18n' and updated it.
The information is completely removed from 'INSTALL-WMAKER' with an
invitation to see the new i18n doc in order to keep that file relatively
small and to avoid duplicating information, which is always harder to
maintain.
Signed-off-by: Christophe CURIS <christophe.curis@free.fr>
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