Add error handling to action handling

[spacegaier]

Breaking change

Proposed change

To assist users with developing their dashboards (easily spot mistakes/issues) and also to properly react to wrong data at runtime, add error toasts to action handling.

I also moved one translation key "action_confirmation" into the new subgroup. I know that we usually try to prevent that, but this key was just recently added by me (12 days ago) so chances are that not too many languages contain it yet, so not so much double-effort, but I really think with the new translation key group it should be moved.

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New feature (thank you!)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Example configuration

Additional information

• This PR fixes or closes issue: fixes #
• This PR is related to issue or discussion:
• Link to documentation pull request:

Checklist

• The code change is tested and works locally.
• There is no commented out code in this PR.
• Tests have been added to verify that the new code works.

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated for www.home-assistant.io