fixed mysql password update on mysql > 5.7

See issue #4321

Closes #4321

See merge request !533

Regression: #3931 Call to undefined function swriteln()



See merge request !534

See issue #4321

Fix User database permission for table ftp_traffic in multi servers setup

Resolution for this issue : ispconfig/ispconfig3#4266

See merge request !530

This reverts commit 6e3c7edd.

add apache_full_version variable for vhost template

See issue #4536

Closes #4536

See merge request !532

See issue #4321

See issue #4536

Let apache handle error document for php files that desn't exist and not fpm



See merge request !531

Fixed error $this to $inst



See merge request !529

Amendment to !527

Fix for #4525 was loading translations from the wrong file, fixed. Sorry for the inconvenience.

See merge request !528

changed template for nginx + LE



See merge request !526

Add translation capatibilities

Fixes the following issues:
- #4484 
- #4525 
- #4526 
- #4527

See merge request !527

Stable 3.1



See merge request !525

SQL mode fixed (install.php and update.php)

This should simplify https://www.howtoforge.com/the-perfect-server-opensuse-13.1-with-apache2-mysql-php-postfix-and-ispconfig-3-p4 **step 8** and fix !480

See merge request !517