sven2.js

let spn = document.getElementsByTagName('span')
let t, i, b
let res = ''
for(let s of spn) {
  let a = 0
  let cn = s.childNodes
  while(a < cn.length) {
    let node = cn[a]

    switch(node.nodeName) {
    case '#text':
      t = node.textContent
      break
    case 'I':
      i = node.textContent
      break
    case 'B':
      b = node.textContent
      t = (t || '').replace(/(\r\n|\n|\r)/gm, ' ').trim()
      i = (i || '').replace(/(\r\n|\n|\r)/gm, ' ').trim()
      b = (b || '').replace(/(\r\n|\n|\r)/gm, ' ').trim()

      if (i === '')
        res += `swe: ${t}, eng: ${b}\n`
      else
        res += `swe: ${t}, grammar: ${i}, eng: ${b}\n`

      t = i = b = undefined

      break
    }

    a++
  }
}
console.log(res)