Update Nuxt i18n

[obulat]

Fixes

Description

This PR updates Nuxt i18n, and adds the necessary changes:

• the locale files are now located in frontend/i18n/locales/ instead of frontend/src/locales/
• the object returned from useI18n is now typed differently (uses the locales available in the app), and it's difficult to get it correct in all environment (unit/Playwright tests, type checks and production), so I refactored the functions that accept i18n object to accept i18n.t instead.
• the fallback locales were removed when migrating to Nuxt 3; added back in this PR.
• the custom pluralization rules created in the follow up PR #5177 (from the data downloaded from GlotPress) added.

The unused i18n-check script was removed

Testing Instructions

The CI should pass, and the app should work correctly without warning. Run the i18n scripts and check that they all work. Delete locale files between running the scripts.

• ov just frontend/run i18n:en
• ov just frontend/run i18n:copy-test-locales
• ov just frontend/run i18n
• ov just frontend/run i18n:copy-test-locales
• ov just frontend/run i18n:no-get (without removing the existing locales: check that they are reused and saved as valid-locales.json)
• ov just frontend/run i18n:create-locales-list
• ov just frontend/run i18n:get-translations
• ov just frontend/run i18n:update-locales
• ov just frontend/run i18n:generate-pot

Checklist

• [ ] My pull request has a descriptive title (not a vague title likeUpdate index.md).
• [ ] My pull request targets the default branch of the repository (main) or a parent feature branch.
• [ ] My commit messages follow [best practices][best_practices].
• [ ] My code follows the established code style of the repository.
• [ ] I added or updated tests for the changes I made (if applicable).
• [ ] I added or updated documentation (if applicable).
• [ ] I tried running the project locally and verified that there are no visible errors.
• [ ] I ran the DAG documentation generator (ov just catalog/generate-docs for catalog PRs) or the media properties generator (ov just catalog/generate-docs media-props for the catalog or ov just api/generate-docs for the API) where applicable.

[best_practices]: https://git-scm.com/book/en/v2/Distributed-Git-Contributing-to-a-Project#_commit_guidelines

Developer Certificate of Origin

Developer Certificate of Origin

``` Developer Certificate of Origin Version 1.1 Copyright (C) 2004, 2006 The Linux Foundation and its contributors. 1 Letterman Drive Suite D4700 San Francisco, CA, 94129 Everyone is permitted to copy and distribute verbatim copies of this license document, but changing it is not allowed. Developer's Certificate of Origin 1.1 By making a contribution to this project, I certify that: (a) The contribution was created in whole or in part by me and I have the right to submit it under the open source license indicated in the file; or (b) The contribution is based upon previous work that, to the best of my knowledge, is covered under an appropriate open source license and I have the right under that license to submit that work with modifications, whether created in whole or in part by me, under the same open source license (unless I am permitted to submit under a different license), as indicated in the file; or (c) The contribution was provided directly to me by some other person who certified (a), (b) or (c) and I have not modified it. (d) I understand and agree that this project and the contribution are public and that a record of the contribution (including all personal information I submit with it, including my sign-off) is maintained indefinitely and may be redistributed consistent with this project or the open source license(s) involved. ```

[github-actions[bot]]

Latest k6 run output[^update]

     ✓ status was 200

     checks.........................: 100.00% ✓ 6400      ✗ 0   
     data_received..................: 1.5 GB  8.2 MB/s
     data_sent......................: 838 kB  4.7 kB/s
     http_req_blocked...............: avg=8.96µs   min=1.91µs  med=3.86µs   max=3.44ms  p(90)=5.31µs   p(95)=5.78µs  
     http_req_connecting............: avg=4.34µs   min=0s      med=0s       max=3.38ms  p(90)=0s       p(95)=0s      
     http_req_duration..............: avg=626.22ms min=39.92ms med=543.75ms max=2.42s   p(90)=1.13s    p(95)=1.22s   
       { expected_response:true }...: avg=626.22ms min=39.92ms med=543.75ms max=2.42s   p(90)=1.13s    p(95)=1.22s   
   ✓ http_req_failed................: 0.00%   ✓ 0         ✗ 6400
     http_req_receiving.............: avg=162.76µs min=41.32µs med=114.71µs max=33.81ms p(90)=182.15µs p(95)=217.54µs
     http_req_sending...............: avg=29.6µs   min=6.14µs  med=19.34µs  max=25.84ms p(90)=25.17µs  p(95)=27.36µs 
     http_req_tls_handshaking.......: avg=0s       min=0s      med=0s       max=0s      p(90)=0s       p(95)=0s      
     http_req_waiting...............: avg=626.02ms min=39.75ms med=543.62ms max=2.42s   p(90)=1.13s    p(95)=1.22s   
     http_reqs......................: 6400    35.533319/s
     iteration_duration.............: avg=3.34s    min=1.22s   med=2.75s    max=9.65s   p(90)=6.53s    p(95)=6.85s   
     iterations.....................: 1200    6.662497/s
     vus............................: 5       min=5       max=30
     vus_max........................: 30      min=30      max=30

[^update]: This comment will automatically update with new output each time k6 runs for this PR

[github-actions[bot]]

Full-stack documentation: https://docs.openverse.org/_preview/5176

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