This ticket treats about the same problem of
MC-66742 and MC-68524: a word that doesn't have correct capitalization. But instead of being in a splash, this bug is about the "Java" word in the Twitch broadcasting message shown when you ran Minecraft with a different Java architecture than the one you used to run the launcher.
The message is displayed exactly like this:
The custom java version used to run Minecraft has a different architecture than the one used to run the launcher [...].
For the same reason of the tickets above, it should be capitalized, while it isn't. It's very simple to fix and only require one change in the language files, like many other currently unresolved string-related bugs.