module I18n::Base

def normalize_keys(locale, key, scope, separator = nil)

keys are Symbols.
Splits keys that contain dots into multiple keys. Makes sure all
Merges the given locale, key and scope into a single array of keys. 
def normalize_keys(locale, key, scope, separator = nil)
  separator ||= I18n.default_separator
  [
    *normalize_key(locale, separator),
    *normalize_key(scope, separator),
    *normalize_key(key, separator)
  ]
end