Added different level of language preference functionaloty which can be
set from the new option in top navigation bar
Lanaguage preference can be set as
* System language (Default for all users)
* Session based (User who are not logged in and want to see they
system in language of their choice can set their preference in browser
session)
* User lever (for authenticated users who have updated their language
preference, system will change into their selected language when they
log into the system)
# Refined UI for showing error messages in new layout of
login/registration/create-ticket/home page while login and registration.
# fixed registration error when email is non mandatory field.
