Spanish Conversation

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*New: Version 2.5
- Improve repeat option
- Play speed feature
- Start from the last lesson opening
- Fix concurrency modification issue
- Allow bookmark in lesson detail

Version 2.4: Improve repeat feature

Version 2.3: Improve app's working speed

Version 2.2
- Night mode & daylight mode
- Better font
- Able to copy text

Update version 2.1: Present No-Ad version

Update version 2.0:
- Fix bugs
- Add more conversations