Translating an WordPress website in Trados Studio

I have received an enquiry for the translation of an entire website that has been created in WordPress and the RWS Community doesn't seem to offer anything specifically on this topic. What I/my client would basically like to know is:

Can I use the WordPress "wp_posts" table from the database, or which export file format is best (SQL, CVS, XML, etc.)?
How can my customer import the translation back into WordPress without overwriting the original German version of the site?
Can they check and/or correct the source file after exporting it from WP and before sending it to me?
How should they handle the translated file and can they review/proofread my translation before importing the English translation back into WordPress?

From what I can find here in the Community, it seems as if WordPress exports XML files or WPML tables. Is that right?

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