Tested the courses. Working fine. No problem in code.
Only one person has given feedback till now. So the more the feedback will be, the more we'd be able to find bugs or other issues.
I have noticed one bug in codecademy exercises. Working on that.
Edit changes have been rejected by Nemo Bis with the explanation:(sorry, I don't understand the point of these changes: en.wiki is used everywhere, other pages should be linked, you removed important sentences; please discuss on talk and/orr explain better).