[Rails] 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

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