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

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

Merged language files.

Removed all inline javascript focus code, general function to protect all password fields including tooltip

Prevent password managers to overwrite passwords in reseller / client and mailbox edit screen (fixes #4030)

First part of fix for issue #3896 - Unknown column 'default_mailserver' in 'field list' when saving client limits main template