Hot fix 1.00.0021

- Improved romaji conversion for some words, such as でんしゃ
- Improved clicked target detection
- Enabled furigana display (based on settings) for conjugation-based exercises in lessons
- Fixed several issues with the test input field, related to the backspace behavior
- Fixed an issue that could cause the player to get stuck before going to the airport in the first level
- Fixed an issue that could cause the player to get stuck during the first rival encounter
- Prevented being blocked in the book tutorial when the search input field was not empty before starting
- Disabled zen mode by default in ninja kana
- Can push blocks using click to move in the Okayama castle
- Other minor bug fixes and localization improvements