Change the order in locale switcher to match the landing pages

[dlind1]

Related to #257-gh-Automattic/i18n-issues

Proposed Changes

Change the order of the locales in the language switcher to make it more intuitive.

Why are these changes being made?

The current list of locales is sorted by the locale code, which is not intuitive to our international users.
The rationale for the new ordering is: start with Latin-based ones sorted by locale code, followed by Cyrillic, Greek, RTL and CCJK locales, sorted by locale code within each group.

Testing Instructions

On calypso.live or locale instance open /themes and /plugins URLs and confirm that the order of the locales in the language switcher generally follows the order from wordpress.com or wordpress.com/pricing, with some changes: the addition of Greek and Romanian and English being at the top in /themes and /plugins.

Pre-merge Checklist

• Has the general commit checklist been followed? (PCYsg-hS-p2)
• Have you written new tests for your changes?
• Have you tested the feature in Simple (P9HQHe-k8-p2), Atomic (P9HQHe-jW-p2), and self-hosted Jetpack sites (PCYsg-g6b-p2)?
• Have you checked for TypeScript, React or other console errors?
• Have you used memoizing on expensive computations? More info in Memoizing with create-selector and Using memoizing selectors and Our Approach to Data
• Have we added the "[Status] String Freeze" label as soon as any new strings were ready for translation (p4TIVU-5Jq-p2)?
• For changes affecting Jetpack: Have we added the "[Status] Needs Privacy Updates" label if this pull request changes what data or activity we track or use (p4TIVU-aUh-p2)?

[github-actions]

Calypso Live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-124871

Jetpack Cloud live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-124871&env=jetpack

Automattic for Agencies live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-124871&env=a8c-for-agencies

[matticbot]

This PR modifies the release build for the following Calypso Apps:

For info about this notification, see here: PCYsg-OT6-p2

• happy-blocks

To test WordPress.com changes, run install-plugin.sh $pluginSlug fix/language-switcher-order on your sandbox.

[matticbot]

This PR does not affect the size of JS and CSS bundles shipped to the user's browser.

Generated by performance advisor bot at iscalypsofastyet.com.