Locales Admin gem will provide front end editor for you or website administrator to manage locales files.

Add this line to your application's Gemfile:

gem 'locales_admin'

And then execute:

$ bundle

Or install it yourself as:

$ gem install locales_admin

Add locales_admin routes on config/routes.rb

mount LocalesAdmin::Engine => "/locales_admin"

Create locales_admin.rb in config/initializers folder

LocalesAdmin.setup do |config|
  config.username = "yourusername"
  config.password = "yourpassword"
end

If you didn't do that, then it will use default configuration like below

LocalesAdmin.setup do |config|
  config.username = "iamadmin"
  config.password = "keepitsecret123"
end

1. Fork it ( https://github.com/41studio/locales_admin/fork )
2. Create your feature branch (git checkout -b new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin new-feature)
5. Create a new Pull Request

This project rocks and uses MIT-LICENSE.