This update was released on April 25th, 2019.
Now based on Lucas' Simpsons Hit & Run Mod Launcher 1.22.4.
Now supports localisation. This does not affect most of the launcher window but it does affect a few buttons, the account window and messages from Hack Support.
The Multiplayer Launcher will use your setting from the regular Mod Launcher if the selected language exists in a Languages folder next to it.
The only way to change the language setting without the regular Mod Launcher is by using the
-selectlanguage command line argument on the Multiplayer Launcher.