Resolve "Refactor project structure"

Proposed changes

- Refactor project structure as follows:

• src
  • app
    • components
      • home
      • creator
        • _dialogs
        • answers-list
        • ...
      • participant
      • shared
      • ...
    • services
      • ...
  • assets
    • i18n
      • creator
        • de.json
        • en.json
      • home
      • participant
  • ...

- Implement lazy loading

- Isolate translation service according to lazy loading

- Add and adjust translation service for several components

Testing

The functionality should be unchanged. Check all available functions of both roles.

Closes #178 (closed)