The problem was discovered and reproduced, tested using Linux deb package, on Linux Mint 20, which is based on Ubuntu 20.04 LTS, the software package was downloaded from the Releases page on GitHub.
Looks like the "About Caprine" dialogue from the "Help" menu is broken since v2.39.0, there is no meaningful information in the window. Screenshot captured as below for the reference.
I manually tested many versions before and after v2.38.0, and to the latest version, just confirmed this issue was introduced since v2.39.0, and I assume it's in all versions between this range, though I didn't see related changed mentioned in the Release/Changelog info.
v2.38.0

v2.39.0

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v2.51.0

Please feel free to let me know if there is any fix needed to be tested and verified and I'll be happy to help ;)
Hi! I've noticed that issue too. Thanks for reporting it!
The about dialogue is created using electron-util and it looks like there are problems with showing icon on Linux https://github.com/sindresorhus/electron-util/issues/19 and for some reason. Also, the name of the app is in lowercase for some weird reason.
This seems to be broken on all Linux builds.
Yeah, I also noticed the app name became lowercase 馃槺 but I'm not sure if it's the same or related problem 馃槄
It seems like a lot of things are broken with electron-util. I'll look into it when I can but any help from anyone who can would be very welcome.
On Manjaro I get this:

Not sure if it's because it's at Caprine 2.51 (Electron 10) and newer than the version of the bug, or just a different issue.
Most helpful comment
It seems like a lot of things are broken with electron-util. I'll look into it when I can but any help from anyone who can would be very welcome.