[Bug] Hide or complete the translated setup guide links until the localized content exists

[shaaravraghu]

Description

The English setup guide presents Japanese, Korean, Simplified Chinese, and Traditional Chinese navigation links as if translated setup docs are available. In practice, each linked file is only a short "currently being translated" stub. This creates a misleading navigation experience for non-English readers.

Component

• Chat Connector
• Flowise Flow
• Demo MCP Server
• Documentation
• Other

Steps to Reproduce

1. Open docs/setup-guide.md.
2. Click any localized language link in the header.
3. Observe that the destination page is only a placeholder stub rather than a translated setup guide.

Expected Behavior

Either:

• provide translated setup content, or
• clearly mark the links in the English nav as incomplete/unavailable until translation is finished.

Actual Behavior

The navigation suggests full translations, but the linked pages contain only a short placeholder message.

Environment

• OS: Any
• Python version: N/A
• Docker version: N/A
• Chat platform: N/A
• Flowise version: N/A

Logs

Relevant files:
- docs/setup-guide.md:3-9
- i18n/ja/docs/setup-guide.md:13-18
- i18n/ko/docs/setup-guide.md:13-18
- i18n/zh-Hans/docs/setup-guide.md:13-18
- i18n/zh-Hant/docs/setup-guide.md:13-18

Additional Context

Evidence

• docs/setup-guide.md
• i18n/ja/docs/setup-guide.md
• i18n/ko/docs/setup-guide.md
• i18n/zh-Hans/docs/setup-guide.md
• i18n/zh-Hant/docs/setup-guide.md

Suggested fix

• Replace the links with explicit "translation in progress" labels
• Or move unfinished locales to a separate section until real translations are available