updated 'list_approved.html' display style (removed column identity)
Fixed a type 'identify' and updated 'list_approved' display contents

* changed 'identify' to 'identity' in Model 'UserProfile'
* updated forms.py, admin.py, profile.html related to 'identity'
* added South migration for renaming field 'identify' to 'identity'
* updated display contents of 'list_approved': removed 'identity' column
* updated 'institute' field name to 'institute (and major)'
* updated related translations