Bookbinder's PDF Booklet Maker by GP v1.5

• Added 20-page signature support to calculation algorithm and GUI.
• Implemented settings.json to persist language preference across sessions.
• Added automatic distribution logic for blank pages (padding):
  splits the pad between start and end pages symmetrically.
• Updated terminology: changed 'booklet' to 'signature' and 'courtesy' to 'blank pages' for better industry accuracy.
• Refactored GUI layout for improved usability.

thanks to the comments of u/LucVolders and u/brigitvanloggem o Reddit.

Bookbinder's PDF Booklet Maker by GP v1.4

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