shared/i18n.js: gettext-style t() / tc() with the Chinese text as msgid (untranslated -> Chinese), {name},
{0} and {n|one|other} params, lists, game-data names (dn / tName), setLang / getLang / onLangChange, and the
server message wire format (msg -> wireMessage -> translateWire). Chinese stays the default, English is a
switch (the owner's decision of 2026-10-05).
tools/build-i18n.mjs (build-data.mjs untouched) walks the zh_CN and EN tables side by side and writes
data/i18n/en.json: the official English of every data/*.json text by record id and field. Blackboard texts
are matched by template (the remake's numbers read back and filled into the English template); stage names
are composed; what the EN client lacks falls back to tools/i18n/fallback-remake.json and fallback-pr70.json
(PR #70 by @YuriRestia). Default EN source ArknightsAssets/ArknightsGamedata (has act2autochess);
Kengxxiao/ArknightsGameData_YoStar is archived (2025-11) and has no 盟约 season (--source yostar).
Coverage: 14 922 / 14 931 texts (99.9 %), 99.3 % official; only 9 CN-only 甄选 operator names stay Chinese.
shared/i18nData.js: the overlay format (index-aligned leaves + a 2-char hash of each Chinese source, so a
stale leaf is never applied). public/js/data.js: setLocale('en') downloads the overlay once; get / lookup /
list return localized copies; getRaw keeps the Chinese file; localeName maps names.
sganggs