Lingua - learn polish language

New German course for Ukrainian speakers: * Added the complete Chapter 1 of Level A1 * 9 units and 27 levels covering greetings, food, animals, family, and everyday conversation * Improved grammatical accuracy and naturalness of German sentences Expansion of the English course for Ukrainian speakers: * Completed the full Chapter 1 of Level A1 * Added new lessons on food, animals, descriptions, family, and demonstrative pronouns * Expanded the vocabulary and improved the Ukrainian translations New English course for Spanish speakers: * Launched the first module of the English course for native Spanish speakers * Added basic vocabulary and sentence structure fundamentals Updated course selection and onboarding: * You can now choose Polish, English, or German as your language of study right at the start * Demo lessons and voiceovers automatically adapt to the selected course * Navigation between courses has been improved Improved voiceovers: * Added voiceover support for English, German, and Polish * Fixed audio playback in speaking exercises to match the selected course language * Improved voiceover quality Speaking Practice improvements: * Progress is now saved separately for each course * Lesson history and completed dialogs are displayed based on the active course * Added full support for German-language dialogs Performance and Quality Improvements: * Optimized dictionary performance * Improved checking of sentence-building exercises * Added support for multiple correct answers * Fixed bugs and improved performance