string translation not working in view,

I haven't change any locales so by default it is set to :en. In validation error its perfectly picking right string from en.yml.

But still in view for normal string translation its not working. e.g <%=t :hello %> is printing "Hello " only.

While my config/locales/en.yml is like below: en:   hello: Hello world

en:   activerecord:     attributes:       user:         uEmail: "E-mail address"         uPassword: "Password"         uPassword_confirmation: "Password confirmation"     errors:       models:         user:           attributes:             Uemail:               blank: "is required"

Any suggestion please ? ruby 1.8.7 rails 3.2.1

Thanks, Amit Suthar