feat: improve posts translation logic

[alexzhang1030]

Description

closes #1118

• move translate to end of contents
• improve translation logic, improve error handling

Error cause I dont have this service. 😅

translate.mp4

Additional context

BTW, I don't know why I can't use onRequestError in nitro, It cannot reached.

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What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Translations update
• Other

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