Update contact information and dokuwiki.org links (SSL/TLS)

change messages and translations

update contact information

[TASK] re-branding: Bitkollektiv -> SYN Systems

remove unnecessary config option 'vector_donate_default'

Fix wrong line endings in french language files (WIN->UNIX)

...plus a typo in $lang["vector_toolbxdef_upload"], reported by
Jérémy Dufour.

update development email contact address

Improve compatibility for pre-Angua releases

Media manager rework

DokuWiki's new media manager made the 'vector_mediamanager_embedded' option
obsolete, therefore this removes it (including relating language vars and
stuff). Additionally, some

Media manager rework

DokuWiki's new media manager made the 'vector_mediamanager_embedded' option
obsolete, therefore this removes it (including relating language vars and
stuff). Additionally, some CSS for the new media manager was added.

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added French translation