chore: support en PDF

[YiniXu9506]

First-time contributors' checklist

• I've signed Contributor License Agreement that's required for repo owners to accept my contribution.

What is changed, added or deleted? (Required)

Support PDF generation for English version.

Which TiDB version(s) do your changes apply to? (Required)

What is the related PR or file link(s)?

• This PR is translated from:
• Other reference link(s):

Do your changes match any of the following descriptions?

• Delete files
• Change aliases

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• TomShawn

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[YiniXu9506]

/merge

[ti-chi-bot]

@YiniXu9506: /merge in this pull request requires 2 approval(s).

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In response to this:

/merge

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