1. Added the auto selection of audio/subtitle tracks based on the current system language. 2. Added the option of shortcut buttons, which can be set to change the aspect ratio. 3. Added recording aspect ratio for independent videos. 4. Fixed the problem that some Remux video subtitles were not displayed correctly. 5. Fixed some WebDAV related bugs. 6. Rewritten most code of the code editor. 7. Fixed some UI issues.