books: Add some books and fix a few papercuts

English

Added

• The GIMP Workbook: A Step-by-Step New Users Manuel
• The Warrior-Poet's Guide to Writing Plug-ins for GIMP 2.10
• GIMP Book of Layers: Everything You Need to Know About Important Layer Concepts & Features
• Pro Photo Colorizing with GIMP
• Learn GIMP: introduction to photo editing
• GIMP Bible
• Levels and Curves with GIMP, 2nd Edition
• GIMP 2.8 for Photographers
• GIMP 2.6 for Photographers
• The GIMP for Linux & Unix
• The Ultimate GIMP 2.8 Guide: Learn Professional photo editing
• The GIMP Bible: Great for beginners
• Sams Teach Yourself GIMP in 24 Hours
• GIMP for Linux Bible
• Enjoy Dijital Painting with GIMP

Updated

• GIMP for Absolute Beginners
• Beginning GIMP: From Novice to Professional
• Beginning Photo Retouching
• The Book of GIMP
• How to GIMP
• The Artist's Guide to GIMP, 2nd Edition
• GIMP 2.6 Cookbook
• GIMP Textile Design
• The Artist's Guide to GIMP Effects
• GIMP 2 for Photographers
• Essential GIMP for Web Professionals
• GIMP Pocket Reference
• Grokking the GIMP
• Guerilla Guide to Great Graphics with The GIMP
• GIMP Essential reference
• GIMP: The Offical Handbook
• The Artists' Guide To the GIMP

Czech

Added

• Digitální fotografie v programu GIMP, 2. aktualizované
• GIMP - praktická uživatelská příručka, 2. aktualizované
• GIMP – grafický editor pro Linux a Windows
• GIMP - Ilustrovaný průvodce

Updated

• 333 tipu a triu pro GIMP
• Digitalni fotografie v programu GIMP
• GIMP 2.8 - Uživatelská příručka pro začínající grafiky
• GIMP: uzivatelska prirucka

Spanish

Updated

• Niveles y Curvas con GIMP (2 ed.)
• Blanco y Negro con GIMP (2 ed.)
• Domine GIMP. Manual práctico
• Niveles y Curvas con GIMP
• Aprende GIMP
• Blanco y Negro con The GIMP

German

Updated

• GIMP 2.10. Das umfassende Handbuch
• Bildbearbeitung mit GIMP 2.10 leicht gemacht. Der praktische Einstieg
• GIMP 2.8
• Das GIMP 2.8-Buch

French

Updated

• GIMP Manuel de référence pour l'édition d'images en logiciel libre
• The GIMP 2.2 pour PC, Mac et Linux
• (A la) SOS GIMP

Polish

Updated

• GIMP. Niesamowite efekty
• GIMP. Poznaj świat grafiki komputerowej
• Fotografia cyfrowa, Obsługa programu GIMP

Brazilian Portuguese

Added

• GIMP - Guia do Usuário, 2ª Edição

Updated

• GIMP - Guia do Usuário