Updating translation catalogs.

Additional bug fixes and enhancements for PR #45

Activating options in XSS Parser

[feature] New robot parameter "allowed_external_origin" to defined external links allowed to be included in sanitized HTML.

Links to images (src attributes) were limited to be under wwsympa_url;
links to other pages (href attributes) were simply inhibited.

Fixed by defusing restrictions so that links with the same origin
(roughly, host part) as wwsympa_url will be allowed.

It makes sense to use the same options as previous versions. Specially AllowHref to don't strip hrefs of links

[bug] "make install" did not create required spools and created spools that will be automatically created.

- Fixed by creating only spools not always created automatically.
- Changed mode of created spools (755 to 750).

- Instead, it will be installed in $bindir.

- Some platforms (at releast macOS) has only "/usr/bin/true".

Rearranging content of Sympa/ConfDef.pm.  Parameter definitions were reordered to be more comprehensive.