added tests for i18n

[maliyildiz1]

No description provided.

[jankapunkt]

const isPlainObj = obj => Object.prototype.toString.call(obj) === '[object Object]'
const equal = (a, b) => {
  const keysa = Object.keys(a).sort()
  const keysb = Object.keys(b).sort()
  
  if (keysa.length !== keysb.length) {
    return false
  }
  
  if (keysa.toString() !== keysb.toString()) {
    return false
  }
  
  // both keys are equal
  return keysa.every(key => {
    const valuea = a[key]
    const valueb = b[key]
    const typea = typeof valuea
    const typeb = typeof valueb
    
    if (typea !== typeb) { return false }
    if (typea === 'string') { return true }
    if (!isPlainObj(valuea) || !isPlainObj(valueb)) { return false }
    
    return equal(valuea, valueb)
  })
}