Firstly, many thanks @HarikalarKutusu as always for your dedication and for preparing this PR - we really appreciate it!

I performed the following checks to review this PR

• Ran the accents.ts and variants.ts raw Typescript through the Typescript linter at https://typescript-eslint.io to check for any errant commas or malformed JSON => All OK

• Manual check of Variants to check they have names in language and an appropriate BCP-47 subtag => all OK

• Manual check of Accents to check they have appropriate accent_name and accent_token => all OK

• I pulled in the PR into main on my local development version and inspected accents.ts and variants.ts => all OK

• Checked database with PR checked out:

SELECT l.name, l.native_name, v.variant_name, v.variant_token 
FROM variants v, locales l
WHERE v.locale_id = l.id 
AND l.name = 'lzz'

SELECT l.name, l.native_name, a.accent_name, a.accent_token 
FROM accents a, locales l
WHERE a.locale_id = l.id 
AND l.name = 'lzz' 

• The one check I wanted to do but was unable was to add the lzz language to my profile in my local development version, then make sure that I had the Variants and Accents available when adding a sentence. In my development environment there is no lzz language to import. I suspect this is because the language hasn't launched yet and the lzz sentences are not available for importing.

This LGTM, approving for merge.
Once again many thanks @HarikalarKutusu and very best wishes for all your work on Circassian languages.