Fix grammar and clarity in samsungtv/strings.json

[SeifEddineMezned]

Breaking change

this PR is not a breaking change

Proposed change

This PR fixes a few grammar and wording issues in user-facing strings in homeassistant/components/samsungtv/strings.json.

• Fixed missing comma and corrected verb tense in conditional sentences ("If you never connected" -> "If you have never connected ..., you should")
• Fixed article and punctuation in error messages ("Host is invalid, please try again." -> "The host is invalid. Please try again.")

Type of change

• Code quality improvements to existing code or addition of tests

Additional information

• This PR fixes or closes issue: none
• This PR is related to issue: none
• Link to documentation pull request: none
• Link to developer documentation pull request: none
• Link to frontend pull request: none

Checklist

• I understand the code I am submitting and can explain how it works.
• 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][dev-checklist]
• I have followed the [perfect PR recommendations][perfect-pr]
• The code has been formatted using Ruff (ruff format homeassistant tests)
• Tests have been added to verify that the new code works.
• Any generated code has been carefully reviewed for correctness and compliance with project standards.

To help with the load of incoming pull requests:

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

[home-assistant]

Hey there @chemelli74, @epenet, mind taking a look at this pull request as it has been labeled with an integration (samsungtv) you are listed as a code owner for? Thanks!

Code owner commands

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[Copilot]

Pull request overview

Improves user-facing copy in the Samsung TV integration’s config flow strings to be clearer and grammatically correct.

Changes:

• Refined invalid host/PIN error phrasing and punctuation.
• Improved conditional wording in setup instructions (“If you have never connected…”).

[coderabbitai]

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[Copilot]

Pull request overview

This PR improves user-facing configuration flow strings for the samsungtv integration to make messages clearer and more consistent with shared Home Assistant translations.

Changes:

• Replaced the integration-specific invalid_host message with the shared common::config_flow::error::invalid_host translation key.
• Refined the invalid_pin error text for clearer grammar and punctuation.
• Improved wording/grammar in the “never connected before” guidance shown during setup.

[chemelli74]

Thx !

[SeifEddineMezned]

@chemelli74 thank you for your support