[i18n] Plugin/connector descriptions not translated in Claude Desktop (fr-FR)

Preflight Checklist

• [x] I have searched existing requests and this feature hasn't been requested yet
• [x] This is a single feature request (not multiple features)

Problem Statement

Claude Desktop (v1.569.0.0, Windows) has a comprehensive i18n system with full French translations for the app shell (278 keys in fr-FR.json) and the web UI (10,830 keys in ion-dist/i18n/fr-FR.json). However, plugin/connector descriptions displayed in the "Customize" section and other marketplace-related views remain in English, even when the locale is set to fr-FR.

This creates an inconsistent user experience where menus, buttons, and labels are in French but plugin names and descriptions are in English.

Proposed Solution

Plugin/connector descriptions served from the marketplace registry should be translated based on the user's locale setting. This could be achieved by:

1. Adding localized name and description fields to plugin manifests (e.g., name_fr, description_fr)
2. Or serving translated metadata from the marketplace API based on the Accept-Language header or user locale
3. At minimum, providing French translations for all first-party Anthropic connectors/plugins

Alternative Solutions

There is no workaround available. The plugin descriptions are served from the marketplace and stored in protected system files (WindowsApps folder). Users cannot modify them without breaking the app signature, and changes would be overwritten on updates.

Use Case Example

1. User has Claude Desktop configured with locale: fr-FR
2. All menus, buttons, and UI labels correctly appear in French
3. User navigates to the "Personnaliser" (Customize) section to browse connectors
4. All connector/plugin names and descriptions appear in English, breaking the otherwise fully localized experience
5. With this feature, all first-party plugin metadata would also be served in French, providing a consistent native experience

Additional Context

• OS: Windows 11 Pro
• Claude Desktop version: 1.569.0.0 (Microsoft Store)
• Locale config: "locale": "fr-FR" in config.json
• The i18n infrastructure is already in place — this is about extending translation coverage to marketplace/plugin content