Automatically change the state of all form buttons to Loading when user submits the form
Add Czech locale for numbers and other defaults
Allow user to specify Invoice line cost
Do not use quotes where not needed
Do not include whole Bootstrap JS, we only need buttons JS right now
Remove accidentaly added duplicate trailing newline
Organize imports in application CSS
Include Bootstrap utilities CSS (mainly for hiding and showing content)
Nest invoice synchronization in DB transaction
Faster & safer for larger datasets
Change state of the login button when user presses it
Welcome message with app name in Root controller
Form for invoice lines editation is initially hidden
It is shown only after the user clicks button to edit invoice lines,
button is added dynamically through JS
fu login button
No leading zero in Czech dates
Translations for Invoice attributes