Bug fixes and improved error messages

New Features

• Show error message when no sites are found in account @astrandb (#326)

Bug Fixes

• Fix for circuit_id not working as reference for service calls. @olalid (#329)

Translation

• Add missing translation keys to some lang files @astrandb (#332)
• Translate NoSites @StevoNL (#330)
• Added translation file for icelandic @snjallingur (#327)
• More status codes - NL translation @StevoNL (#324)