Added French localization

• Added French localization

Improved DTD parsing

• Improved DTD parsing

Improved encoding handling

• Improved encoding handling

Added catalog manager

• Added catalog manager

Added support for very large XML files

• Added support for very large XML files

Switched to Java 21

Switched to Java 21

Switched to UTF-8 for .properties

• Switched to UTF-8 for .properties

Extracted localizable strings

• Extracted localizable strings

Initial release

• Extracted XML code from OpenXLIFF Filters.