The Spanish translation lacks a lot of text, there are scenes in which there is nothing, maybe some error in the code? The strange thing is that in the history there is no trace of text either unless the language is changed, but at the same time put it back in Spanish the text disappears again
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Short explanation:
The translator taking care of spanish could only commit to translating a previous version, so content since then is missing translation.
Long explanation:
Italian is the only language that is completely (or almost completely) translated up to the newest version (The game page lists what versions which languages are translated up to). If I recall correctly spanish is only translated up to the cart scene. Translation is on a volunteer-basis, so this sort of thing will happen.
Also, when I make spelling corrections or changes on english strings, the translations usually get broken.