I18N: Use _x() with verb context for translatable 'Reply' strings

[sanketio]

Summary

Fixes the ambiguous translation of the string 'Reply' used as a button/link label in comments UI. In some languages (e.g., German), "Reply" as a noun and as an imperative verb translate differently. Without a translator context, GlotPress cannot distinguish between uses, leading to mistranslations.

Replaces all __( 'Reply' ) occurrences with _x( 'Reply', 'verb' ) and adds /* translators: */ docblock comments, consistent with the existing pattern used for _x( 'Spam', 'verb' ) in the same codebase.

Changes

• src/wp-admin/includes/dashboard.php — Use _x() for Reply button in dashboard comment actions.
• src/wp-admin/includes/class-wp-comments-list-table.php — Use _x() for Reply button in comments list table row actions.
• src/wp-includes/comment-template.php — Use _x() for default reply_text in get_comment_reply_link().
• src/js/_enqueues/admin/edit-comments.js — Expose wp.i18n._x alongside wp.i18n.__, and use _x() for both Reply button text assignments.

Testing

1. Verify the comments admin screens (/wp-admin/edit-comments.php) still show "Reply" buttons correctly.
2. Verify the comment reply link renders correctly on the front end.
3. Verify the dashboard Recent Comments widget still shows a "Reply" action link.
4. Optionally: confirm the new verb context appears in GlotPress under the wp/dev project strings for 'Reply'.

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Trac ticket: https://core.trac.wordpress.org/ticket/64984

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Use of AI Tools

AI assistance: Yes
Tool(s): GitHub Copilot
Model(s): Claude Sonnet 4.6
Used for: Identifying all affected locations, implementing the _x() replacements, and drafting this PR description; changes were reviewed before submission.

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This Pull Request is for code review only. Please keep all other discussion in the Trac ticket. Do not merge this Pull Request. See GitHub Pull Requests for Code Review in the Core Handbook for more details.

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