Title explains the update, mostly. It has been added as an alternate launch option since the game’s old code can’t handle switching between languages. Additionally, a few bugs in both versions have been corrected.
Spanish translation released
Source: Steam Community (opens in a new tab)
Build and release context
Steam update times within 24 hours of this post. Matching dates do not confirm which build it describes.
Build 10677816 · public branch
Steam updated · First observed