Release v2.6.0

• Redesign the Kanban view.
• Feature: Admin to prevent users from logging in. Make users Inactive or Blocked.
• Improved the menu items.
• Redesign all of the forms for adding or editing issues to be more consistent and user friendly.
• Tags management simplified to 3 standard "unchangeable" groups (Types, Status, & Resolution).
• Feature: added support for german translation. Thanks to @nickbe
• Stop links from leaving full screen mode on iOS devices.
• Bug fixes and other minor improvements.