i18n = require 'i18n'

-- loading stuff
i18n.set('en.welcome', 'welcome to this program')
i18n.load({
  en = {
    good_bye = "good-bye!",
    age_msg = "your age is %{age}.",
    phone_msg = {
      one = "you have one new message.",
      other = "you have %{count} new messages."
    }
  }
})
i18n.loadFile('path/to/your/project/i18n/de.lua') -- load German language file
i18n.loadFile('path/to/your/project/i18n/fr.lua') -- load French language file
…         -- section 'using language files' below describes structure of files

-- setting the translation context
i18n.setLocale('en') -- English is the default locale anyway

-- getting translations
i18n.translate('welcome') -- Welcome to this program
i18n('welcome') -- Welcome to this program
i18n('age_msg', {age = 18}) -- Your age is 18.
i18n('phone_msg', {count = 1}) -- You have one new message.
i18n('phone_msg', {count = 2}) -- You have 2 new messages.
i18n('good_bye') -- Good-bye!

-- the most usual one
i18n.set('variables', 'Interpolating variables: %{name} %{age}')
i18n('variables', {name='john', age=10}) -- Interpolating variables: john 10

i18n.set('lua', 'Traditional Lua way: %d %s')
i18n('lua', {1, 'message'}) -- Traditional Lua way: 1 message

i18n.set('combined', 'Combined: %<name>.q %<age>.d %<age>.o')
i18n('combined', {name='john', age=10}) -- Combined: john 10 12k

i18n = require 'i18n'

i18n.load({
  en = {
    msg = {
      one   = "one message",
      other = "%{count} messages"
    }
  },
  ru = {
    msg = {
      one   = "1 сообщение",
      few   = "%{count} сообщения",
      many  = "%{count} сообщений",
      other = "%{count} сообщения"
    }
  }
})

i18n('msg', {count = 1}) -- one message
i18n.setLocale('ru')
i18n('msg', {count = 5}) -- 5 сообщений

…
i18n.loadFile('path/to/your/project/i18n/de.lua') -- German translation
i18n.loadFile('path/to/your/project/i18n/en.lua') -- English translation
i18n.loadFile('path/to/your/project/i18n/fr.lua') -- French translation
…

return {
  de = {
    good_bye = "Auf Wiedersehen!",
    age_msg = "Ihr Alter beträgt %{age}.",
    phone_msg = {
      one = "Sie haben eine neue Nachricht.",
      other = "Sie haben %{count} neue Nachrichten."
    }
  }
}

return {
  de = {
    good_bye = "Auf Wiedersehen!",
    age_msg = "Ihr Alter beträgt %{age}.",
    phone_msg = {
      one = "Sie haben eine neue Nachricht.",
      other = "Sie haben %{count} neue Nachrichten."
    }
  },
  fr = {
    good_bye = "Au revoir !",
    age_msg = "Vous avez %{age} ans.",
    phone_msg = {
      one = "Vous avez une noveau message.",
      other = "Vous avez %{count} noveaux messages."
    }
  },
  …
}