# locales/en.yml
en:
  message_template: "Hello %{name}, how are you on this %{day} !"

# my_view.html.erb
<%= t(:my_template, name: @user.name, day: DateTime.now.strftime('B') %>

# locales/en.yml
en:
  message_template:
    - "Hello %{name}, how are you on this %{day} !"
    - "Hi %{name}, nice %{day} isn't it ? how are you ?"

# my_view.html.erb
<%= t('my_template.sample'), name: @user.name, day: DateTime.now.strftime('B') %>