Translate workflow creation and Slack install updates to es/fr/zh

[mintlify]

Summary

Translates changes from #4489 into Spanish, French, and Chinese:

• Updated workflow creation steps (3–6) to reflect more specific configuration guidance
• Updated Slack notification note to reference the Mintlify Slack app
• Simplified Slack notification setup steps 1–2

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Note

Low Risk
Low risk: documentation-only text updates in translated MDX files with no code or behavior changes.

Overview
Updates the Spanish, French, and Chinese agent/workflows.mdx docs to reflect the latest dashboard workflow-creation flow (more explicit steps around naming, trigger type, repos/schedule, agent instructions, and auto-merge).

Clarifies Slack notifications to require installing the Mintlify Slack app, and simplifies the first Slack setup steps for enabling Notify on completion.

^{Written by Cursor Bugbot for commit 853ce9c. This will update automatically on new commits. Configure here.}