I've translated some things from the official Kyoukai no Kanata website (http://anime-kyokai.com/). If I add more things, I'll list them in this post.
character voice samples (grouped together since they're so short)
product/goods/* (grouped together since there's so many of them)
onair (updated Sept 20)
Addendum: I'm not going to do a second editing pass on these website translations or anything, so WYSIWYG. If you let me know that there's something wrong, though, I'll fix it.