Locale files
en:
example:
translation: "Hello world!"
interpolation: "Hi %{name}, have a great %A!"
pluralization:
one: "One item"
other: "%{count} items"
Chop up your locale files and place them in subdirectories. Use YAML or JSON files, or mix them together. Organise them any way you prefer.
Warning
Beware, though, that there is a fixed loading order. JSON files are loaded first, then YAML files. So in the unlikely situation where you have the same key in a JSON and a YAML file, YAML will take precedence.