Dragon Quest IV: Chapters of the Chosen English translation
ドラゴンクエストIV 導かれし者たち · Dragon Quest IV: Michibikareshi Mono-tachi
A script patcher by concreted that brings the official English text plus the party chat lines from the mobile release into the Japanese DS version, so the DS game can finally be played in English with party chat.
What it does
The Western DS release of Dragon Quest IV left out party chat, and its code switches the feature off. The later Android release does have English party chat, and its script files can be loaded by the Japanese DS game, but that game does not understand the English text's control codes for plurals, pronouns and similar words, so they show up as raw symbols.
concreted's Python tool takes the English script from the US DS game and the party chat script from the Android release, rewrites the problem codes into plain text, reflows lines so words are not cut at the edge of the text box, shortens chapter titles that would overflow and puts everything into the Japanese DS game.
Options and limits
You can choose male, female or neutral pronouns, and an alternative mode that shows English by default with speaker names in the text. In the normal mode English is turned on with a cheat code given in the README. Some leftovers remain: the name entry screen and a few map and shop labels stay in Japanese, most item and monster names are lowercase, and plurals are sometimes wrong. The README lists them all.
Playing it
You need your own copies of the Japanese and US DS games and of the Android release's data file; the tool builds the result for you, following the steps in the repository.
A separate patch by spiderfreak1011, built on this work, later fixed the party chat text scrolling on by itself.
Credits
Script patcher by concreted.