Thanks, it speaks English now
It did not happen as described in the link you sent though. Yosemite does not have Languages and Text, but rather Languages and Regions. On my computer English was shown as the only language. German was nowhere in sight. So I started fooling around. I clicked the + sign to add a language and chose English-U.S. I set that as my primary language and rebooted. Success! Photoshop Elements speaks English to me now. How or why it was speaking German remains a mystery. I just hope it doesn't change its mind some time in the future and continues to speak English.
John (frogpond88)