Important: #107971 - XLF files now use 2-space indentation

Description

TYPO3 Core XLF (XLIFF) translation files now consistently use 2-space indentation instead of tabs. This aligns with the formatting used by Crowdin and by PHP's \DOMDocument. The .editorconfig file has been updated accordingly.

In addition to indentation, all XLF files have been normalized using a unified XML formatter. This ensures consistent XML declaration, attribute ordering, and whitespace structure across all XLF files in the Core.

Checking and normalizing XLF formatting

A new script has been introduced to check and normalize XLF formatting.

Checking formatting via `runTests.sh`

To check whether XLF files have correct formatting (dry-run, no modifications):

./Build/Scripts/runTests.sh -s normalizeXliff -n

This command scans all XLF files in typo3/sysext/ and reports files that would be changed.

Normalizing XLF files via `runTests.sh`

To normalize all XLF files in-place:

./Build/Scripts/runTests.sh -s normalizeXliff

This command applies consistent indentation and XML normalization to all XLF files in typo3/sysext/.

Using the standalone script

The script can also be run directly. Requires PHP 8.2+ with DOM and intl extensions enabled.

# Show help
./Build/Scripts/xliffNormalizer.php --help

# Check files only (dry-run)
./Build/Scripts/xliffNormalizer.php --root typo3/sysext --dry-run

# Normalize files in place
./Build/Scripts/xliffNormalizer.php --root typo3/sysext

# Check a custom directory
./Build/Scripts/xliffNormalizer.php --root path/to/xlf/files --dry-run

Impact

Extension developers should update their XLF files to use 2-space indentation and expect normalized XML formatting. The provided script can also be used within extensions to keep XLF files consistent with TYPO3 Core standards.