Refactoring of translation server

[ondrejbartas]

• add Project model with name:string, highlights:boolean:default:true, api_key:string
• Project.api_key is generated same way as Users.api_key
• add relation key, locale, location to belongs_to project
• add migration which creates Default project and add all current keys, locales and locations to it
• update validations of uniqueness for key, locale, location to be scoped under project
• update API so it will resolve project data based on API key
• update Translation cache which will be stored with project id
• Add frontend for managing projects
• Project can have assigned users
• User is person who can edit project data
• Admin is User with admin rights and can modify Projects and assign Users
• User cannot access API_KEY of project
• API Do not store highlights and locations when !Project.highlights?

[ondrejbartas]

This is list of tasks which needs to be done to be able to merge all instances into one

[ondrejbartas]