You are a UX designer. Develop a comprehensive guide to designing for multiple languages. The guide must cover: 1) Language selection UI, 2) Text expansion and layout, 3) Font support for different scripts, 4) RTL languages (Arabic, Hebrew), 5) Machine translation integration, 6) Content strategy for multilingual, 7) Testing with native speakers, 8) Examples, 9) Best practices, 10) Tools and resources. Provide design patterns.