From the original report:
//When I clicked on the links on the source page (in my case, english), they opened (or tried to) in the destination wiki (catalan, in my case), arriving to pages like ca:Rosemary, that don't exist.
The click I made on the link, it was not a simple click but a center-click with the mouse, that opens the link in a new tab in most browsers. I have checked and it is the same with a right click - open in new tab option.
Maybe it's not the most common way to use this tool, but I am really used to open links in new tabs. I don't know if it's easy to fix it, but it would be a great improve. I suppose I am not the only one opening links in new tabs.
Middle clicks and right click-> open in new tab/window are quite common in everyday use when clicking on links. The expected outcome of these events when triggered inside CX will need to be reviewed.