docs: add component translation example

[hamedrabah]

What changed

• Added an Internationalization section to the component theming guide.
• Documented using content with a translation catalog.
• Added a state-aware French example that preserves loading and upload progress.
• Called out the equivalent UploadDropzone fields.

Why

UploadThing supports custom component copy, but the docs did not explain how to use it for localization.

Verification

• pnpm exec prettier --check docs/src/app/(docs)/concepts/theming/page.mdx
• pnpm --filter 'docs...' build

Closes #916

Summary by CodeRabbit

• Documentation
  • Added guidance for customizing component content with fixed text or state-aware callbacks.
  • Documented available upload, drag-and-drop, file-type, and progress states.
  • Added guidance for internationalizing UploadThing components through the content prop.
  • Included a French example covering loading, upload progress, and file selection states.
  • Explained how to localize UploadDropzone labels, buttons, and allowed-content messages.
  • Clarified formatting for progress percentages in translated upload status text.

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[coderabbitai]

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ℹ️ Recent review info

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📒 Files selected for processing (1)

• docs/src/app/(docs)/concepts/theming/page.mdx

🚧 Files skipped from review as they are similar to previous changes (1)

• docs/src/app/(docs)/concepts/theming/page.mdx

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Walkthrough

The theming documentation explains ContentField callbacks and adds an Internationalization section. It shows state-based UploadDropzone content and French translations supplied through content props.

Changes

Internationalization documentation

Layer / File(s)	Summary
Content field guidance docs/src/app/(docs)/concepts/theming/page.mdx	Documents ContentField callback state and shows dynamic UploadDropzone labels and file-count text.
Translation content guidance docs/src/app/(docs)/concepts/theming/page.mdx	Documents translation-catalog usage with French text for loading, upload progress, and file selection. It also covers UploadDropzone content fields.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Merge Risk: ⚪ Minimal · up to b39ec

This documentation-only change is merge-ready after normal checks and review; no actionable merge-blocking risk remains.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly identifies the main change: adding a component translation example to the documentation.
Linked Issues check	✅ Passed	The changes satisfy issue #916 by documenting ContentField callbacks, explaining translation through the content prop, and providing a French translation example for UploadThing components.
Out of Scope Changes check	✅ Passed	All documented changes support issue #916 and the stated objective. No unrelated changes are identified.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…

Full details: Docstring Coverage

Explanation

No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0 files. (1 skipped: 1 unsupported.)

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[greptile-apps]

Confidence Score: 5/5

The documentation-only change appears safe to merge.

The documented content fields, callback arguments, and upload-progress semantics match the current public component APIs and existing usage.

Important Files Changed

Filename	Overview
docs/src/app/(docs)/concepts/theming/page.mdx	Adds an internationalization example consistent with the current UploadButton and UploadDropzone content APIs.

_{Reviews (1): Last reviewed commit: "docs: add component translation example" | Re-trigger Greptile}

[coderabbitai]

Actionable comments posted: 1

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Inline comments:
In `@docs/src/app/`(docs)/concepts/theming/page.mdx:
- Line 553: Update the French upload-progress formatting in the translation
catalog or its usage so the rounded percentage is separated from `%` by a
non-breaking space, producing output such as “Téléversement 42 %” while
preserving the existing progress calculation.

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• docs/src/app/(docs)/concepts/theming/page.mdx

Included review availability: Your plan provides up to 8 included reviews per hour; 7 remain after this review.