feat(v2): Add Turkish translations for theme labels

[caglarturali]

Motivation

To provide default translations in Turkish.

Have you read the Contributing Guidelines on pull requests?

Yep.

Test Plan

(Write your test plan here. If you changed any code, please provide us with clear instructions on how you verified your changes work. Bonus points for screenshots and videos!)

N/A

Related PRs

(If this PR adds or changes functionality, please take some time to update the docs at https://github.com/facebook/docusaurus, and link to your PR here.)

N/A

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[netlify]

Deploy preview for docusaurus-2 ready!

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[github-actions]

⚡️ Lighthouse report for the changes in this PR:

Category	Score
🟢 Performance	92
🟢 Accessibility	96
🟢 Best practices	100
🟢 SEO	100
🟢 PWA	95

Lighthouse ran on https://deploy-preview-4312--docusaurus-2.netlify.app/classic/

[github-actions]

Size Change: 0 B

Total Size: 532 kB

ℹ️ View Unchanged

Filename	Size	Change
website/build/assets/css/styles.********.css	87.1 kB	0 B
website/build/assets/js/main.********.js	359 kB	0 B
website/build/blog/2017/12/14/introducing-docusaurus/index.html	60.3 kB	0 B
website/build/docs/introduction/index.html	235 B	0 B
website/build/index.html	25.4 kB	0 B

_{compressed-size-action}

[facebook-github-bot]

Thank you for signing our Contributor License Agreement. We can now accept your code for this (and any) Facebook open source project. Thanks!

[slorber]

Thanks for your submission!

Can you please double-check the last updated by labels so that they handle all the possible edge-cases?

[caglarturali]

Looks good to me now. 😊

[slorber]

thanks :)