JP = Japanese.
What the person is saying is a lot of times the Base games get translated, but the DLC's don't and can only be played on the Japanese version of the game. However this time around the DLC was also translated, and thus can be played on the English version as well.
Yes, with a caveat. In he base game you can get pregnant at least once without locking yourself into any endings, although you can't give birth. There are ways of dealing with pregnancy more than once, but you have to find them. If you don't abort the baby, you will get one of the Endings to the game.
However, with the Append installed, as long as you've already played through a specific ending (sorry, can't remember which) then this issue doesn't apply, and you can even give birth without hitting a Game Ending iirc. (sorry, been a long time since I've played and looked into this game, so memory is not that great).
