That's nice. Here's another translation
And I will pour out upon the house of David and upon the inhabitants of Jerusalem a spirit of grace and supplications. And they shall look to me because of those who have been thrust through [with swords], and they shall mourn over it as one mourns over an only son and shall be in bitterness, therefore, as one is embittered over a firstborn son.
The translation that supports the second coming was not added to support Christian doctrine-Christians quote the verse as they believe the Tanakh writers talk about the Messiah.