Quick and dirty translation helper

gistfile1.js

currentLocale = 'en';
locales = {
  en: {
    'common.between': 'less than __ but more than __'
  }
};

t = function(key, ...insertions) {
  let translatedString = locales[currentLocale][key];
  return translatedString.replace(/__/g, () => insertions.shift());
}

t('common.between', 5, 10); //= 'less than 5 but more than 10'

Things this doesn't do:

• Pluralisation
• Ordered insertions
• default language on missing keys
• logging missing keys
• exporting all used keys