Send reminder is not sending mail for Events

Send reminder is not sending mail for Events

Fixes #356 - Labels under the "Customize" button not translated.
Fixes #360 - Broken Reports

Usability issues in users list view

Report list view issues
Import usability issues

Purchase Order creation failed from Products
Task creation fails from Task management page

Purchase Order creation failed from Products
Task creation fails from Task management page

This makes it possible for the admin to choose their preferred language in the first step of the installer. That choice applies to the rest of the installation process and is set as the default system language in the config file.