Translate content: dashboard inbox docs (es, fr, zh) - #7927

Running Vale across on the following files affected by this PR:

- es/dashboard/notifications.mdx
- es/editor/collaborate.mdx
- es/editor/pages.mdx
- fr/dashboard/notifications.mdx
- fr/editor/collaborate.mdx
- fr/editor/pages.mdx
- zh/dashboard/notifications.mdx
- zh/editor/collaborate.mdx
- zh/editor/pages.mdx
- es/dashboard/inbox.mdx
- fr/dashboard/inbox.mdx
- zh/dashboard/inbox.mdx

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