Update interface/lib/classes/remote.d/client.inc.php, interface/lib/classes/functions.inc.php, interface/web/client/client_edit.php files

#4961 modified remote API client edit to include lock and cancel, functions moved from client_edit to functions

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

    - make sure umlautdomains can be found in lists.
    - sorting by database name did not work in database quota list.
    - IDN: use standard from 2008 (which also works with "ß").

- changed/harmonized order of clients in client select fields ("ORDER BY client.company_name, client.contact_name, sys_group.name")

- mail accounts not locked when client locked
- mail account sending and receiving lock separated
- fixed error in query
- fixed wording to match separeted locks

- Added email message templates.

- Resellers can use templates for their clients.

Removed workarounds