Fix descriptions of send_command action for consistency

[NoRi2909]

Proposed change

Three small fixes for the description keys of the send_command action of the Homeworks integration:

• use third-person singular for descriptive wording
• change to "the command" to match "the controller" in two strings

Both ensure better and more consistent machine and human translations.

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)
• Deprecation (breaking change to happen in the future)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Additional information

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

Checklist

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