Remove undefined pf-themed shortcodes breaking Hugo build (remaining languages)

[adil-aspose]

Summary

• Removes the leaked blocks/products/pf/main-wrap-class / main-container / tutorial-page-section shortcode pair and the stray products-backtop-button call from the remaining 21 language variants of java/export-conversion/groupdocs-viewer-java-convert-archives-html/_index.md.
• This repo has no templates for those shortcodes (they were leaked from a different product's theme), which was breaking the Hugo build on the arabic variant: failed to extract shortcode: template for shortcode "blocks/products/pf/main-wrap-class" not found.
• The arabic and french variants of this same page were already fixed directly on master in prior commits; this PR applies the identical fix to every other language.

Test plan

• Verified via dry-run parse that each file's shortcode block matches the exact known-bad structure before stripping (no blind string replace).
• Verified no blocks/products/pf or backtop-button references remain in any of the 21 files.
• Confirm Hugo build succeeds for all affected languages after merge.

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