Translate page views metric documentation to es, fr, zh

[mintlify]

Summary

• Added translations for the new page views metric documentation section to Spanish, French, and Chinese
• Updated the traffic source description in all three languages to include page views and assistant usage metrics
• Added the new "Views" section with translated content about monitoring page view analytics

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Note

Low Risk
Low risk documentation-only changes that adjust translated copy and add a new section, with no product logic impact.

Overview
Adds a new translated Views/page views section to es/optimize/analytics.mdx and zh/optimize/analytics.mdx, describing page-view charts and top pages.

Updates the traffic-source filtering description in both languages to include page views and assistant usage in the human-traffic metrics list.

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