Working very well in my Xperia M dual running Jelly Bean MR2 (Android 4.3) but I think I found an issue...
In my list of networks this module correctly display the password of all networks, except one I have that's an 802.11x network. I checked my wpa_supplicant and I can confirm it's not encrypted. I can provide you my wpa_supplicant file, if helps (just PM me).
Another suggestion would be providing some feedback to the user if it tries to view the password of a network that doesn't have a password (like a public network), or even better, if possible, hide the option to show password of the user selects one of those public networks.
Also, do you have any plans to implement translations? If yes I would like to contribute with Brazilian Portuguese translation...
Sony Xperia M dual [C2004]
ROM: 15.5.A.1.5 (stock)
Android version: 4.3 (rooted)
Bootloader: locked (unlockable)