Github is mostly out of date, unfortunately. The latest patch, as posted in the translation thread, is located here:
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For chapter 4 content, Camazotz was completely translated by a kind soul, but the rest of it is machine translation only.
I've been working on manually translating Chapter 4-2, but unfortunately Lv1Villager (The person who maintains it and made the auto-translator) seems to have been away from the forum for the last month, so he hasn't updated the OP recently. Once I get to a point where I can call most of the work translated, I'll probably release my own version of the patch. Next week will be busy, but I was fairly close to completely translating all of Daiji's battle lines, as well as most of the main dialogue other then the secret tape.
As for a translation of the new EX content, I have no idea how to make a new version of the machine translation to cover it, sorry.