🌐 Enable theme translations for Casper

[cathysarisky]

This PR wraps Casper's translatable strings in the t helper. I've opted to swap "zero" for "0", to match other themes and reduce translator workload, and not to translate "Message" and "Ref" that appear only on the non-404 error template.

[coderabbitai]

Walkthrough

This pull request adds internationalization (i18n) support across multiple Handlebars template files in a Ghost theme. Hard-coded UI text strings are systematically replaced with translation helper calls using the {{t "..."}} syntax. Changes affect six template files: default.hbs (header and footer labels), error-404.hbs and error.hbs (error page text), partials/post-card.hbs (post metadata and badges), post.hbs (post header and byline), and tag.hbs (collection description). Most replacements are straightforward string-to-translation conversions, with one notable exception in tag.hbs where static text is replaced with a pluralized translation expression supporting zero, singular, and plural forms.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description check	✅ Passed	The description clearly explains the PR's purpose of wrapping translatable strings in the t helper, with specific implementation details about handling zero forms and exclusions.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Title check	✅ Passed	The title clearly summarizes the main change: enabling theme translations for the Casper theme by wrapping translatable strings with the t helper across multiple template files.

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✨ Finishing Touches

• 📝 Generate docstrings (stacked PR)
• 📝 Generate docstrings (commit on current branch)

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch t-string-wrapping

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