Storage history and mail monitoring improvements

Added

• Storages in hideouts and on islands are now also recognized for storage history tab
• Added weekly statistics for mail monitoring tab
• The position of the Grid Splitter is now saved
• Islands are now displayed with names in the map history
• Storages in the storage history can now also be deleted

Changes

• Renamed sales to net profit for mail monitoring tab
• Updated translation file for Russian
• Improved cluster information events to get more information like hideout or island name

Full Changelog: 5.7.0...5.7.1