Changing the page title to match current item

When working in an edit form it's not always clear what it current item is. Especially when working on dns changes in multiple zones it can get confusing.

I suggest to add the current content name to the h1 element at the top of the pageContent.

vs.

vs.

When creating a new zone there is obviously nothing to add to the title.

I'm preparing a MR for these two examples, and if we agree on the structure we can probably add this for a few more types.