Add Ukrainian (uk) language support to Claude.ai interface and documentation

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

Ukrainian language support is missing from the Claude ecosystem while Russian is fully supported. This includes: no UI localization for claude.ai (web/mobile), no Ukrainian documentation (/docs/uk/ returns 404 while /docs/ru/ works), and no voice input/output in Ukrainian. This is a follow-up to #26829.

Proposed Solution

Add Ukrainian (uk) localization to the Claude.ai interface, documentation site, and voice mode — the same way Russian (ru) is already supported.

Alternative Solutions

_No response_

Priority

High - Significant impact on productivity

Feature Category

CLI commands and flags

Use Case Example

I am a Claude user from Ukraine. Ukrainian is my native language and the official state language of 40+ million people. Since February 2022, Russia has been conducting a full-scale war against Ukraine. Maintaining Russian support while omitting Ukrainian sends the wrong signal for an ethically responsible company. Ukrainian is already listed in the upcoming Voice Mode expansion — applying the same to UI and docs would be a low-cost, high-impact fix.

Additional Context

_No response_