Issue
The issue fixed was found in this bug report on Utopian.io. It prevented users on Steemit with their account language set to Spanish from viewing their private keys on Steemit. This is the relevant GitHub issue I created on the Condenser project that mirrors the bug report on Utopian.
Solution
After digging through the structure of Condenser (I was unfamiliar with the code base), I located the problem in the ShowKey class. Then, because the problem only happened in the Spanish language, and there were no conditional statements about the language in ShowKey, I knew it had to come from the locale files. So, I dug into the Spanish locale file and found that the values userkeys_jsx.public_something_key and userkeys_jsx.private_something_key were trying to reference another value called count that didn't exist. I compared this to the other locale files and changed count to key, which fixed the problem.
Posted on Utopian.io - Rewarding Open Source Contributors