Fix markdown lint errors and add pt_BR language support

[Copilot]

Addresses maintainer feedback on PR gibbok#137 for Brazilian Portuguese translation: fixes MD012/MD022 markdown lint failures and integrates pt_BR into the tooling pipeline.

Markdown Fixes (README-pt_BR.md)

• Removed 4 instances of double blank lines (lines 1425, 2033, 2836, 3804)
• Added missing blank line before heading at line 662

Language Integration

tools/i18n.ts

• Added pt_BR to Language enum, type, and array

tools/make-books.sh

• Added pt_BR variables (INPUT_PT, OUTPUT_PT, TITLE_PT)
• Added pandoc, epubcheck, and ebook-convert commands for pt_BR epub/pdf generation
• Fixed pre-existing bug: line 54 now validates English epub instead of duplicating Chinese validation

Note

Compile errors in pt_BR are pre-existing translation issues (missing <!-- skip --> comments: 26/54 present vs English). Out of scope for this lint fix.

Original prompt

Fix Markdown Lint Issues and Add pt_BR Language Support

Context

This PR is for the Brazilian Portuguese translation of the TypeScript book. The maintainer has requested fixes for markdown linting errors and the addition of pt_BR language support to the tools configuration.

Reference: gibbok#137

Tasks to Complete

1. Fix Markdown Lint Errors in README-pt_BR.md

The GitHub Actions workflow is failing due to MD012/no-multiple-blanks errors. There are 4 locations with multiple consecutive blank lines that need to be fixed:

• Line 1425: Remove one blank line (Expected: 1 blank line, Actual: 2)
• Line 2033: Remove one blank line (Expected: 1 blank line, Actual: 2)
• Line 2836: Remove one blank line (Expected: 1 blank line, Actual: 2)
• Line 3804: Remove one blank line (Expected: 1 blank line, Actual: 2)

For each location, find the double blank lines and reduce them to a single blank line.

2. Add pt_BR Language Support to Tools Configuration

Following the pattern from PR gibbok#132 (Belarusian translation), add Brazilian Portuguese language support:

File: tools/i18n.ts

Add pt_BR to the Language enum and update the types:

export enum Language {
    en_EN = 'en_EN',
    zh_CN = 'zh_CN',
    it_IT = 'it_IT',
    pt_BR = 'pt_BR',  // ADD THIS LINE
}
export type Languages = [Language.en_EN, Language.zh_CN, Language.it_IT, Language.pt_BR]  // UPDATE THIS

export const languages: Languages = [Language.en_EN, Language.zh_CN, Language.it_IT, Language.pt_BR]  // UPDATE THIS

File: tools/make-books.sh

Add Brazilian Portuguese book generation commands following the existing pattern:

INPUT_PT="README-pt_BR"
OUTPUT_PT="typescript-book-pt_BR"
TITLE_PT="The Concise TypeScript Book"

# In the pandoc generation section, add:
pandoc -o $DIR_DOWNLOADS/$OUTPUT_PT.epub --metadata title="$TITLE_PT" --metadata author="$AUTHOR" -s $INPUT_PT.md

# In the epubcheck validation section, add:
epubcheck $DIR_DOWNLOADS/$OUTPUT_PT.epub

# In the PDF generation section, add:
ebook-convert $DIR_DOWNLOADS/$OUTPUT_PT.epub $DIR_DOWNLOADS/$OUTPUT_PT.pdf --pdf-page-numbers

3. Verify the Changes

After making the changes:

• Run npm run check in the tools directory to ensure no lint errors
• Verify that the markdown file passes all checks
• Ensure the language configuration is properly integrated

Expected Outcome

• All markdown lint errors should be resolved
• The GitHub Actions workflow should pass ✅
• The pt_BR language should be properly configured in the tools setup
• The translation will be ready for merge into the main repository

Notes

• Follow the exact same pattern used for other language translations (zh_CN, it_IT)
• Maintain consistency with the existing codebase structure
• Do not modify any translation content, only fix formatting and configuration

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