Re#7531 Components are guarded against invalid users
Re #7494 Components connected to API - except profile settings and add vacation components
Re#7527 SnackBar opens if the error occurs
Re#7527 Implemented import and export files on front end
Re #7499 User profile component initialized
Refactor service structure
Re #7498 Global settings component implemented
Re#7494 Implemented edit user settings
Refactored all models
Re#7493 Finished services except xlsx service
Re#7493 Modified and tested Users service
Re#7459 Implemented first popup
Re#7470 Implemented basic table