Remove Hass.io terms in strings.json

[LEJOUI]

Breaking change

Proposed change

In some strings there were a few Hass.io left. This will rename them to Supervisor

Type of change

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

Example entry for configuration.yaml:

# Example configuration.yaml
n/a

Additional information

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

Checklist

• The code change is tested and works locally.
• Local tests pass. Your PR cannot be merged unless tests pass
• There is no commented out code in this PR.
• I have followed the development checklist
• The code has been formatted using Black (black --fast homeassistant tests)
• 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

If the code communicates with devices, web services, or third-party tools:

• The manifest file has all fields filled out correctly.
  Updated and included derived files by running: python3 -m script.hassfest.
• New or updated dependencies have been added to requirements_all.txt.
  Updated by running python3 -m script.gen_requirements_all.
• Untested files have been added to .coveragerc.

The integration reached or maintains the following Integration Quality Scale:

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• I have reviewed two other open pull requests in this repository.

[homeassistant]

Hi @LEJOUI,

It seems you haven't yet signed a CLA. Please do so here.

Once you do that we will be able to review and accept this pull request.

Thanks!

[probot-home-assistant]

Hey there @Kane610, mind taking a look at this pull request as its been labeled with an integration (deconz) you are listed as a codeowner for? Thanks!
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[probot-home-assistant]

Hey there @gcampax, @balloob, mind taking a look at this pull request as its been labeled with an integration (almond) you are listed as a codeowner for? Thanks!
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[Kane610]

I don't think supervisor add-on is the proper naming here

[milanmeu]

Many translators ask questions about this on Lokalise.
The translations are inconsistent. The table below shows the translations with corresponding languages for component::mqtt::config::step::hassio_confirm::title.

Translation	Languages
Hass.io	English, Catalan, Chinese Traditional, Estonian, French, Italian, Korean, Norwegian, Polish
Supervisor	Bulgarian, Chinese Simplified, Czech, Danish, Dutch, German, Hungarian, Indonesian, Luxembourgish, Portuguese, Portuguese Brazil, Romanian, Slovenian, Ukrainian, Swedish, Spanish, Spanish Latin America
Home Assistant	Russian
Untranslated	Afrikaans, Arabic, Armenian, Basque, Bosnian, Croatian, English UK, Esperanto, Finnish, Frisian, Galician, Greek, Hebrew, Hindi, Icelandic, Japanese, Latvian, Lithuanian, Norwegian Bokmål, Norwegian Nynorsk, Persian, Serbian, Serbian Latin, Slovak, Swiss German, Tamil, Telugu, Thai, Turkish, Urdu, Vietnamese, Welsh