Use new dialogs in the Call/Calling page

[jordibc]

Instead of the hand-made alerts that the Call and Calling pages use to notify about errors, use these:
https://github.com/EyeSeeTea/FIRE-WiFiCalling/wiki/Dialogs

[jordibc]

Nah, it seems they are not ready to show error messages yet. See comments in https://github.com/EyeSeeTea/FIRE-WiFiCalling/wiki/Dialogs

[MurhafSousli]

@jordibc

Question (Jordi): is this up-to-date? It seems that instead of importing DialogComponent from ../shared/fire-dialog one has to import DialogComponent from ../../shared/dialog/dialog, at least that is currently the case in the development branch.

Right, you have to locate the DialogComponent according to your component location.

Another question (Jordi): it seems that there are no dialogs ready to show the errors as they appear in here for example: https://marvelapp.com/1d00fg0/screen/18291072

We have discussed this earlier and decided to use the DialogComponent for error messages too. so that error message you pointed in the MarvelApp will not be used.