Enhancements:
- Switch messages to English when installing in English environment.
- English manual prepared.
- Outputs <thead> tags in tables.
- Added option to specify JavaScript file path to <script> tag of <head>.
- Added option to specify media attribute when linking CSS.
- Adjusted included CSS to reflect enhancements.
Corrections:
- When deleting an empty <p> tag, the bullet ending tag was deleted.
- Output <img> tags for bulleted children.
