changed loglevel to WARN when mailbackup fails



See merge request !516

Fix #4332 (password reset empty From address)



See merge request !515

Fix #4061 clarified sql-check during install / updates



See merge request !513

Fixed #4425 Variable is initialized as string but later written to as array, throws fatal error in PHP 7.1

Fixed #4444 Error in the template htm /usr/local/ispconfig/interface/web/client/templates/reseller_edit_limits.htm

Fixed #4443 Error in the template htm /usr/local/ispconfig/interface/web/client/templates/client_edit_limits.htm

Fixed #4440 Error in the template htm /usr/local/ispconfig/interface/web/client/templates/client_template_edit_limits.htm

small typo in french translation



See merge request !511

Improved the code that generates the ssh keys for clients and shell users and reorganized it into a central function.

minor updates to postfix' amvis-service



See merge request !510