Use {{DISPLAYTITLE}} content in title elt if set

 * Continues on 8f6103b362fce6f24506febb707e59091273e145.

 * An example, enwiki/Xx_(album)?oldid=616824054

Bug: 49076
Change-Id: I59e1fcdedbcbac0f307a130a31ba4780b336e7da
Merge "Use {{DISPLAYTITLE}} content in title elt if set"