Bunpro Japanese SRS

- Added Hiragana learning for new users.
- Added missing Spanish translations
- Fixed a bug where hint level changed to “Hide”
- Fixed a bug where the vocab title at the top didn’t update after using “Mark as Mastered” during study session
- Fixed notifications not working on Android devices (you may need to toggle them off and on).
- Fixed app slowing down during the first run.
- Other bug fixes and improvements.