Rails i18n for accepts_nested_attributes_for (with has_many) using anchors

es.yml

# Singular. This works for the following
#   form_for @tree do |f|
# We can use an anchor (&tree) to have the values available
tree: &tree
  name: Nombre
  age: Edad

# Plural. This works for the following
#   # forest.rb
#   class Forest < ApplicationRecord
#     has_many :trees
#     accepts_nested_attributes_for :trees, reject_if: :all_blank
#   end
# 
#   # tree.rb
#   class Tree < ApplicationRecord
#     belongs_to :forest
#   end
# 
#   # form.html.haml
#   form_for @forest do |f|
#     f.fields_for :trees do |trees_form|
trees: *tree