Load embedded locales

You may want to embed locales with a go-bindata tool within your application executable.

1. install a go-bindata tool, e.g.

   $ go get -u github.com/go-bindata/go-bindata/...

2. embed local files to your application

   $ go-bindata -o locales.go ./locales/...

3. use the LoadAssets method to initialize and load the languages

   ^ The AssetNames and Asset functions are generated by go-bindata

ap.I18n.LoadAssets(AssetNames, Asset, "en-US", "el-GR", "zh-CN")