Checklist

Invalid date

[1.3.0]
- Improvement: Support white color and advanced color picker
- New option: App Info > Dark mode
- New option: Task list > Hide fast scrollbar(to avoid mistake when create sub-task)
- New option: Completing the task > When the sub-task is unchecked, uncheck the parent task
- New options: Data management > Recover sticky notifications
- New option: Create sticky notification also when create task
[1.2.9]
- Fix crashes
[1.2.8]
- Update German translation