title: How to add two label-field pair as one row to QFormLayout?
body: <p>So I have QFormLayout that manages my QLabel-QLineEdit pairs just fine. <BR>
  Problem is, that I need to achive something like this:
  <img src="https://i.stack.imgur.com/OSrrK.png" alt="enter image description here"></p>
  
  <p>Horizontal border/tittle isn't a problem, but "Street"-"Apartment"/"Post code"-"City" pairs are.</p>
  
  <p>So my question is: <B>how to add two pairs of QLabel-QLineEdit as one row to QFromLayout?</B></p>
  
  <p>If it's not possible with QFormLayout, do you have any suggestion about achivining the same with other layout (QGridLayout, I guess)?</p>
  
  <p>Keep in mind, that labels can have different size proportions after translated to other languages.</p>
  
  <p>Thanks in advance!</p>