Change languages to String array type in UpdateServicesServer Get-TargetResource return value

[jortencio]

Pull Request (PR) description

Updates the returned value for the languages value in the return value for UpdateServicesServer Get-TargetResource function

This Pull Request (PR) fixes the following issues

Fixes #76

Task list

• [x] Added an entry under the Unreleased section of the change log in the CHANGELOG.md. Entry should say what was changed, and how that affects users (if applicable).
• [ ] Resource documentation added/updated in README.md.
• [ ] Resource parameter descriptions added/updated in README.md, schema.mof and comment-based help.
• [ ] Comment-based help added/updated.
• [ ] Localization strings added/updated in all localization files as appropriate.
• [ ] Examples appropriately added/updated.
• [x] Unit tests added/updated. See DSC Resource Testing Guidelines.
• [ ] Integration tests added/updated (where possible). See DSC Resource Testing Guidelines.
• [ ] New/changed code adheres to DSC Resource Style Guidelines and Best Practices.

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This change is 

[NicolasBn]

Hello @jortencio thanks for your contribution. Can you complete the CHANGELOG.md file ?

[jortencio]

Hi @NicolasBn , I have updated the CHANGELOG.md file as requested to reflect the changes in this PR.

[NicolasBn]

Hi @jortencio thank you for your change. In your issue @sooyean-hoo referenced the same issue with Products collection. Can you add this fix in your PR? And maybe added some pester tests to cover your changes?

[jortencio]

Hi @NicolasBn as requested I have added pester tests to cover my changes. Regarding the products collection, I had a brief look and there doesn't seem to be an issue with the implementation for it.