Updates README.md.en

This commit fixes grammatical and spelling mistakes, improves formatting
and rearranges headings for better readability.
Fixes messages written in English

This commit fixes few spelling and grammatical mistakes present in the
UI code.
add scripting functionality
Merge branch 'master' of git://github.com/talha131/wasavi into talha131-master
update ja-messages according to an en-messages