[FEATURE] Add localization (l10n) support for extension UI strings (e.g. permission dialogs)

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

The Claude Code VS Code extension has no .nls.json / l10n/ localization
files, so UI strings like the tool-permission approval dialogs (Allow/Deny)
stay in English regardless of VS Code's configured display language.

Proposed Solution

Could the extension adopt VS Code's standard l10n mechanism
(https://code.visualstudio.com/api/references/vscode-api#l10n) so these
strings can be translated, starting with widely-used languages (Polish
included)?

Alternative Solutions

_No response_

Priority

Low - Nice to have

Feature Category

Performance and speed

Use Case Example

_No response_

Additional Context

_No response_