fix(i18n): align translation domain structure

[zachyale]

Description

As part of the work for #1484 and #1485, an audit into our existing localization structures surfaces that the author browser translations for most foreign languages are not being properly ingested/were not generated

Linked Issue

Related to #1484 + #1485

Changes

• Add missing empty author browser JSONs
• Add missing import/exports in locale index.ts files
• Fix two placeholder errors in Croatian/Slovenian

Manual Testing Steps

Verify the placeholders now work for HR/SL

Screenshots (Optional)

N/A

Additional Context (Optional)

Once pre-merge CI checks are merged in for localization structure enforcement, without this PR the repo would not be in compliance with the new CI localization validations

AI Disclosure

None

Checklist

• This PR links and implements an accepted issue.
• This PR is a single focused change.
• There are new or updated tests validating this change.
• I ran just ui check and just api check.
• I have added screenshots if there were any UI changes.
• I have disclosed any AI usage as per the organization AI Policy above.
• I understand all of my submitted changes.

[coderabbitai]

Important

Review skipped

Review was skipped due to path filters

⛔ Files ignored due to path filters (23)

• frontend/src/i18n/de/author-browser.json is excluded by !frontend/src/i18n/**
• frontend/src/i18n/de/index.ts is excluded by !frontend/src/i18n/**
• frontend/src/i18n/fr/author-browser.json is excluded by !frontend/src/i18n/**
• frontend/src/i18n/fr/index.ts is excluded by !frontend/src/i18n/**
• frontend/src/i18n/hr/author-browser.json is excluded by !frontend/src/i18n/**
• frontend/src/i18n/hr/book.json is excluded by !frontend/src/i18n/**
• frontend/src/i18n/hr/index.ts is excluded by !frontend/src/i18n/**
• frontend/src/i18n/it/author-browser.json is excluded by !frontend/src/i18n/**
• frontend/src/i18n/it/index.ts is excluded by !frontend/src/i18n/**
• frontend/src/i18n/ja/author-browser.json is excluded by !frontend/src/i18n/**
• frontend/src/i18n/ja/index.ts is excluded by !frontend/src/i18n/**
• frontend/src/i18n/nl/index.ts is excluded by !frontend/src/i18n/**
• frontend/src/i18n/pl/author-browser.json is excluded by !frontend/src/i18n/**
• frontend/src/i18n/pl/index.ts is excluded by !frontend/src/i18n/**
• frontend/src/i18n/pt/author-browser.json is excluded by !frontend/src/i18n/**
• frontend/src/i18n/pt/index.ts is excluded by !frontend/src/i18n/**
• frontend/src/i18n/ru/author-browser.json is excluded by !frontend/src/i18n/**
• frontend/src/i18n/ru/index.ts is excluded by !frontend/src/i18n/**
• frontend/src/i18n/sl/author-browser.json is excluded by !frontend/src/i18n/**
• frontend/src/i18n/sv/author-browser.json is excluded by !frontend/src/i18n/**
• frontend/src/i18n/sv/index.ts is excluded by !frontend/src/i18n/**
• frontend/src/i18n/zh/author-browser.json is excluded by !frontend/src/i18n/**
• frontend/src/i18n/zh/index.ts is excluded by !frontend/src/i18n/**

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