Translate and proof about_en.html

- Tweak grammar and flow
- Simplify and reduce verbosity
- Reduce duplication
- Consistent terminology
- Judicious use of "keywords" that are relevant 
- Reduce use of "jail" where implicit or not required
- Remove paragraphs that detract from the main message
Merge pull request #2 from koobs/patch-1

Translate and proof about_en.html - Round #1