Access all static labels, button names, titles, placeholder from en.yml
Apply labels from "en.yml" in "send_donation_notification_to_donar.html.haml" and display email in donation_pdf.html.haml
Apply static lable captions in all files of "instructor" section
Apply captions on all labels, buttons and links in workshop's html files
Apply static lables for "sign in" from en.yml
Apply captions on static lables in "_link.html" and "forgot password" page
Apply captions, button titles, labels in "forgot password" and "registration" html pages from "en.yml"
Merge branch 'development' into development_bug_parthiv

Conflicts:
	app/views/donations/index.html.haml
Removed home page heading
Remove ":" from en.yml
colspan modified
Change button class and add cancel button in required form
removed email uniqness validation from donation.rb (we don't need at this place)
New suggested UI modification
donations search query refactored
.split redundancy has been removed
created a helper method for returning css_class and msg_icon_class
application controller refactored
flash message render_css method modified
Merge branch 'development' into development_bug_parthiv