Add Welsh translation for cookies page

[hbrace]

Motivation and Context

There was some missing translation on the Welsh cookies page

What has changed

Translation added

How to test?

make build and start in your own env
Check the page and ensure the text matches the document attached to the Jira card
Run ATs

Links

https://jira.ons.gov.uk/browse/SDCSRM-383

Screenshots (if appropriate)

[github-actions]

🦙 MegaLinter status: ✅ SUCCESS

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ BASH	shellcheck	3		0	0.03s
✅ MARKDOWN	markdownlint	1		0	0.22s

See detailed report in MegaLinter reports

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• oxsecurity/megalinter/flavors/[email protected] (49 linters)
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• oxsecurity/megalinter/flavors/[email protected] (54 linters)
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[ryangrundy7]

Translations looks good 👍 Only difference I can see is what they've said for on and off which doesn't match the others. Maybe a question for Louise but I don't think it's an issue.