[w3c/manifest] Internationalization -> Internationalization Considerations, clarifications (PR #1234)

Closes #1232

This change:
* [x] Makes editorial changes (changes informative sections, or changes normative sections without changing behavior)
* [x] Is a "chore" (metadata, formatting, fixing warnings, etc).

**Commit message:**
```
editorial: Formalize Internationalization appendix as Internationalization Considerations and clarify UA localization options
```

**Description:**
This PR addresses feedback from the horizontal internationalization review:
- Rename the appendix to "Internationalization Considerations" as preferred by the spec guidelines.
- Link directly to the spec definitions for `localized text object`, `lang`, and `dir` properties of `*_localized` members.
- Present the two main ways user agents handle localized values (pass-through localization vs. on-demand/update-time evaluation), clarifying that UAs have flexibility in implementation (e.g. Chrome's behavior of verifying name changes at update time).
- Link to relevant W3C i18n articles on language negotiation rather than reproducing their content.
- Ran HTML `tidy` to format the modified section.


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<a href="https://pr-preview.s3.amazonaws.com/dmurph/manifest/pull/1234.html" title="Last updated on Jul 23, 2026, 10:53 PM UTC (70c7e7b)">Preview</a> | <a href="https://pr-preview.s3.amazonaws.com/w3c/manifest/1234/c472e76...dmurph:70c7e7b.html" title="Last updated on Jul 23, 2026, 10:53 PM UTC (70c7e7b)">Diff</a>
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/manifest/pull/1234

-- Commit Summary --

  * Formalize Internationalization appendix as Internationalization Considerations and clarify UA localization options

-- File Changes --

    M index.html (54)

-- Patch Links --

https://github.com/w3c/manifest/pull/1234.patch
https://github.com/w3c/manifest/pull/1234.diff

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