Getting Diary's to work.

[Som1Lse]

If you havent set up debug mode then read this tutorial.

If/when you have just press F1.

Edit: Now that I think of it, it might also be the case that it never reads your "extra_english.lang" file because you are in debug mode and not running a custom story.
It might also be that you havent dont have any voice narration (or whatever it is called), which diaries might need. This is however untested and only a theory.