I don't have the time right now to learn how to work Aegisub, so in lieu of that, here are translated scripts for all the commercials and promotional videos for Kyoukai no Kanata that have been released so far. As more come out and I translate them, I'll update this post.
light novel PV (video)
New Show Announcement (video)
If anybody wants to slap these on a video as subtitles, go right ahead.