feat(i18n): extract java-agent namespace strings

[eruizdechavez]

Summary

• Adds `en/java-agent.json` and `es/java-agent.json` covering all user-visible strings in the java-agent feature
• Covers 48 source files: the full list of java-agent components, hooks, utilities, and pages
• Replaces hardcoded module-level constants (`FORMAT_TABS`, `INSTRUMENTATIONS_SECTION_LABEL`, `CONTROL_TYPE_DISPLAY`, `SEMANTIC_CONVENTION_MAP`, `FEATURE_MAP`) with `t()` or `getI18n().t()` calls so labels stay translatable outside React component scope
• Integrates `standalone-library-tab.tsx` added in [feat] Add Standalone Library tab to Java instrumentation detail page #664 (landed after the original branch was created)
• Fixes follow-up strings found during manual testing: list page description/count/banner and format tab labels
• Initializes i18next in the integration test setup, which had no i18next instance and caused all integration tests to fail after the namespace was introduced

Test plan

• `bun run typecheck` passes
• `bun run test` passes (1023 unit tests)
• `bun run test:integration` passes (51 integration tests)
• Java Agent instrumentation list, detail, and configuration builder pages render correctly in both languages

Assisted-By: This contribution was prepared with the assistance of an AI development tool.

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[Copilot]

Pull request overview

Note

Copilot was unable to run its full agentic suite in this review.

Introduces internationalization (i18n) support across the Ecosystem Explorer UI, including a feature-flagged language switcher and English/Spanish translation bundles.

Changes:

• Add i18next + react-i18next configuration (HTTP backend + optional language detection via I18N feature flag).
• Replace hardcoded UI copy across multiple pages/components with translation keys.
• Add en/es locale JSON files and update dev/test feature-flag env defaults.

Reviewed changes

Copilot reviewed 68 out of 69 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
ecosystem-explorer/src/test/setup.ts	Initializes i18n resources for unit tests.
ecosystem-explorer/src/main.tsx	Loads i18n configuration at app startup.
ecosystem-explorer/src/lib/feature-flags.ts	Adds I18N feature flag.
ecosystem-explorer/src/i18n/config.ts	New i18next configuration with backend + optional language detection.
ecosystem-explorer/src/features/not-found/not-found-page.tsx	Moves 404 copy to translations.
ecosystem-explorer/src/features/java-agent/utils/format.ts	Translates semantic convention + feature labels via i18n.
ecosystem-explorer/src/features/java-agent/java-release-comparison-page.tsx	Moves page text to translations.
ecosystem-explorer/src/features/java-agent/java-instrumentation-list-page.tsx	Moves list UI strings (errors/loading/results) to translations.
ecosystem-explorer/src/features/java-agent/java-configuration-list-page.tsx	Moves configuration list strings to translations.
ecosystem-explorer/src/features/java-agent/java-agent-page.tsx	Moves landing copy to translations.
ecosystem-explorer/src/features/java-agent/instrumentation-detail-page.tsx	Moves detail page labels/tooltips/empty states to translations.
ecosystem-explorer/src/features/java-agent/configuration/configuration-builder-page.tsx	Moves builder UI strings to translations.
ecosystem-explorer/src/features/java-agent/configuration/components/union-renderer.tsx	Localizes ARIA label for union chooser.
ecosystem-explorer/src/features/java-agent/configuration/components/preview-card.tsx	Localizes preview card labels + ARIA text.
ecosystem-explorer/src/features/java-agent/configuration/components/plugin-select-renderer.tsx	Localizes plugin picker labels/placeholders.
ecosystem-explorer/src/features/java-agent/configuration/components/list-renderer.tsx	Localizes list add/remove UI + empty text.
ecosystem-explorer/src/features/java-agent/configuration/components/instrumentation-row.tsx	Localizes row labels, counts, and ARIA strings.
ecosystem-explorer/src/features/java-agent/configuration/components/instrumentation-config-form.tsx	Localizes empty-state message.
ecosystem-explorer/src/features/java-agent/configuration/components/instrumentation-config-field.tsx	Localizes control labels, pills, and default preview.
ecosystem-explorer/src/features/java-agent/configuration/components/instrumentation-browser.tsx	Localizes browser headings/readouts/empty states.
ecosystem-explorer/src/features/java-agent/configuration/components/group-renderer.tsx	Localizes enable toggle ARIA label.
ecosystem-explorer/src/features/java-agent/configuration/components/field-section.tsx	Localizes expand/collapse ARIA label + empty fallback.
ecosystem-explorer/src/features/java-agent/configuration/components/controls/primitive-list-control.tsx	Localizes list control labels + empty state.
ecosystem-explorer/src/features/java-agent/configuration/components/controls/key-value-map-control.tsx	Localizes map control labels/placeholders + announcements.
ecosystem-explorer/src/features/java-agent/configuration/components/controls/focus-managed-input-list.tsx	Localizes accessibility announcements.
ecosystem-explorer/src/features/java-agent/configuration/components/controls/field-meta.tsx	Localizes “Default” label.
ecosystem-explorer/src/features/java-agent/configuration/components/controls/control-wrapper.tsx	Localizes “default” badge and reset link text.
ecosystem-explorer/src/features/java-agent/configuration/components/configuration-toc-sidebar.tsx	Localizes tabs, search, and nav labels.
ecosystem-explorer/src/features/java-agent/configuration/components/circular-ref-placeholder.tsx	Localizes circular reference message.
ecosystem-explorer/src/features/java-agent/components/version-selector.tsx	Localizes default “Version” label.
ecosystem-explorer/src/features/java-agent/components/telemetry-section.tsx	Localizes telemetry section headers and empty states.
ecosystem-explorer/src/features/java-agent/components/telemetry-comparison/version-selector-panel.tsx	Localizes comparison selector UI strings.
ecosystem-explorer/src/features/java-agent/components/telemetry-comparison/telemetry-comparison-section.tsx	Localizes comparison loading/errors/warnings.
ecosystem-explorer/src/features/java-agent/components/telemetry-comparison/span-diff-card.tsx	Localizes diff card status + messages.
ecosystem-explorer/src/features/java-agent/components/telemetry-comparison/metric-diff-card.tsx	Localizes diff card labels/messages.
ecosystem-explorer/src/features/java-agent/components/telemetry-comparison/diff-results-section.tsx	Localizes diff result headers and empty-state text.
ecosystem-explorer/src/features/java-agent/components/telemetry-comparison/attribute-diff-table.tsx	Localizes attribute diff table headings/status text.
ecosystem-explorer/src/features/java-agent/components/sub-instrumentation-item.tsx	Localizes item ARIA label.
ecosystem-explorer/src/features/java-agent/components/multi-instrumentation-group-card.tsx	Localizes versions count label.
ecosystem-explorer/src/features/java-agent/components/instrumentation-filter-bar.tsx	Localizes filter labels, placeholders, and tooltips.
ecosystem-explorer/src/features/java-agent/components/instrumentation-configuration-tab.tsx	Localizes “no options” empty state.
ecosystem-explorer/src/features/java-agent/components/instrumentation-badges.tsx	Localizes badge labels/tooltips/ARIA labels.
ecosystem-explorer/src/features/java-agent/components/configuration-selector.tsx	Localizes selector banner/label.
ecosystem-explorer/src/features/java-agent/components/configuration-card.tsx	Localizes default/examples/usage strings.
ecosystem-explorer/src/features/java-agent/components/attribute-table.tsx	Localizes attributes table labels.
ecosystem-explorer/src/features/java-agent/components/agent-explore-landing.tsx	Localizes landing navigation card copy.
ecosystem-explorer/src/features/home/components/hero-section.tsx	Localizes hero headline + tagline.
ecosystem-explorer/src/features/home/components/explore-section.tsx	Localizes explore navigation cards.
ecosystem-explorer/src/features/collector/collector-page.tsx	Localizes collector landing copy + unavailable state.
ecosystem-explorer/src/features/collector/collector-detail-page.tsx	Localizes collector detail labels/sections/stability/type descriptions.
ecosystem-explorer/src/features/collector/collector-components-page.tsx	Localizes collector components list UI.
ecosystem-explorer/src/components/ui/copy-button.tsx	Localizes “Copy/Copied” default labels.
ecosystem-explorer/src/components/ui/back-button.tsx	Localizes “Back” default label.
ecosystem-explorer/src/components/layout/header.tsx	Localizes header nav + adds feature-flagged language switcher.
ecosystem-explorer/src/components/layout/footer.tsx	Localizes footer copy and links.
ecosystem-explorer/public/locales/es/layout.json	Adds Spanish layout translations.
ecosystem-explorer/public/locales/es/java-agent.json	Adds Spanish Java Agent translations.
ecosystem-explorer/public/locales/es/home.json	Adds Spanish home translations.
ecosystem-explorer/public/locales/es/common.json	Adds Spanish common translations.
ecosystem-explorer/public/locales/es/collector.json	Adds Spanish collector translations.
ecosystem-explorer/public/locales/en/layout.json	Adds English layout translations.
ecosystem-explorer/public/locales/en/java-agent.json	Adds English Java Agent translations.
ecosystem-explorer/public/locales/en/home.json	Adds English home translations.
ecosystem-explorer/public/locales/en/common.json	Adds English common translations.
ecosystem-explorer/public/locales/en/collector.json	Adds English collector translations.
ecosystem-explorer/package.json	Adds i18n dependencies.
ecosystem-explorer/bun.lock	Locks i18n dependency versions.
ecosystem-explorer/.env.test	Disables I18N for tests.
ecosystem-explorer/.env.development	Enables I18N for development.

Comments suppressed due to low confidence (4)

ecosystem-explorer/src/i18n/config.ts:1

• With HttpBackend, translations load asynchronously. react-i18next defaults to Suspense-based loading; if the app isn't wrapped in a <Suspense fallback={...}>, initial renders can throw/suspend. Fix by either (a) adding react: { useSuspense: false } to the i18n init options and handling readiness manually, or (b) wrapping the application root in a Suspense boundary with an appropriate fallback.
  ecosystem-explorer/src/i18n/config.ts:1
• The config registers the about namespace, but this PR doesn't add /public/locales/{lng}/about.json. That will cause backend requests for missing files (and potentially trigger Suspense or error noise depending on configuration). Either add en/about.json + es/about.json, or remove about from ns until those files exist.
  ecosystem-explorer/src/i18n/config.ts:1
• The document <html lang> is only updated on languageChanged, so the initial language may never be applied (especially when language detection selects a non-default language on first load). Set document.documentElement.lang after initialization as well (e.g., in the init promise resolution or an initialized event handler) to ensure screen readers and accessibility tooling see the correct language from the first paint.
  ecosystem-explorer/src/test/setup.ts:1
• i18next init(...) returns a promise; running it at module top-level without awaiting can create ordering/flakiness in tests that render before initialization completes. Move initialization into a beforeAll and await the init promise (or use initImmediate: false in the test-only init config if appropriate for your setup).

[jaydeluca]

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