- Swap the position of dialog buttons

# Conflicts:
#	projects/editor/src/app/app.module.ts
#	projects/editor/src/app/services/dialog.service.ts
#	projects/editor/src/app/services/unit.service.ts

- Add translations for operators
- Improve and extend the evaluation of visibility rules

This hack allows the page tabs to have a pseudo tab to create a new 
page.
This tab is disabled so the user can not change to it, but is still 
clickable.

They are treated as containers by the player and therefore have no
values that can be queried.

- Fix typo in css classname

- Refactor directive

- Basic implementation

Update/angular

Also restructure files containing interfaces.

Octal characters are deprecated and don't work anymore. This solution 
uses an empty string over the whole line.

#502

- Add ReferenceManager to check if deleted elements are referenced 
anywhere in the unit. If so display a warning.
- Move page logic to UnitService

Update/translate package