Add Simplified Chinese localization

[AwHsR15]

Summary

• Register :zh and add complete Simplified Chinese application, Devise, and Rails framework locales.
• Run a dedicated Chinese-language review across all 3,512 application strings and 47 Devise strings; correct terminology, fragmented UI strings, calendar labels, account/security copy, and Rails validation wording.
• Extend the Rails locale with current framework keys that were previously absent, including comparison validation messages and pluralized storage units.
• Keep a regression spec that verifies English-key coverage plus interpolation, markup, URL, and template-token parity.

Verification

• The application TSV and its eight review chunks agree exactly on all 3,512 application keys.
• Strict YAML parsing passed for all three Chinese locale files (including duplicate-key detection).
• Locale coverage check: 3,559 English leaves, 0 missing Chinese leaves, 0 type mismatches, and 0 interpolation/markup/URL/template-token mismatches.
• The reviewed import was checked item-by-item: 3,512 application strings, 47 Devise strings, and 159 directly corresponding Rails leaves. One legacy Rails byte scalar was intentionally upgraded to the current one/other schema.
• git diff --check passed.
• Ruby/Bundler are unavailable locally and the Docker daemon is stopped, so the RSpec suite could not be run in this environment.

The initial draft was machine-assisted, followed by a dedicated Simplified Chinese linguistic review and static validation. This PR is now ready for maintainer review; please merge it into dev if it fits the project's localization conventions.

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[AwHsR15]

Language QA update complete: the full Simplified Chinese corpus has received a dedicated review, the fragile UI fragments and framework wording were corrected, and static coverage/token checks pass. The branch now contains commit 12f0eda and is ready for maintainer review and merge into dev if it meets the project's localization conventions. Note: Ruby/Bundler are unavailable locally and the Docker daemon is stopped, so I could not run the RSpec suite in this environment.

[Freika]

@AwHsR15 can I ask you to review my commit? ebbc19f

If it's all good, I'll merge the branch, thank you!

[AwHsR15]

Reviewed your commit ebbc19f — looks good.

One note on the place_name_locked change: reverting 建议地点 back to the literal Suggested place was the right call. Place::DEFAULT_NAME is the hardcoded string 'Suggested place', so a Chinese user following the translated instruction would have typed a name the code does not recognise.

Happy to keep reviewing the Chinese strings you add in future releases — just ping me on the PR.