docs(changelog): condense #188 into a single entry

CHANGELOG.md

@@ -9,9 +9,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Added
 
-- Per-session i18n routing and localized scenarios (phase C of [#188](https://github.com/Mezeporta/Erupe/issues/188)): `Session.I18n()` returns a cached, language-resolved `i18n` table built via `getLangStringsFor(s.Lang())`; `SetLang` invalidates the cache. All 51 existing `s.server.i18n.*` call sites in `handlers_commands.go`, `handlers_guild.go`, `handlers_guild_scout.go`, `handlers_cafe.go`, and `handlers_cast_binary.go` now route through `s.I18n().*`, so chat replies, guild invite mails, cafe reset notices, and quest-timer broadcasts are served in the player's preferred language. Scenario JSON subheader `strings` and inline entry `text` fields now accept the same plain/map `LocalizedString` schema as quests (phase B); `CompileScenarioJSON` takes a language argument and `loadScenarioBinary` passes `s.Lang()`. Round-tripping existing `.bin` files through the JSON path still produces byte-identical output. World-wide broadcasts (Raviente siege announcements via `BroadcastRaviente`) intentionally remain on the server default because they have no single-session context.
+- Server-side multi-language support ([#188](https://github.com/Mezeporta/Erupe/issues/188)): each player picks their own language with `!lang <en|jp|fr|es>`, persisted per user (migration `0022_user_language`) and loaded on login. Chat replies, guild invite mails, and cafe/timer broadcasts are served in that language via `Session.I18n()`. Quest and scenario JSON text fields now accept either a plain string (unchanged) or a `{"jp":"...","en":"...","fr":"..."}` map; the compiler resolves per session and the quest cache is keyed by `(questID, lang)`. Existing single-language JSONs and `.bin` round-trips remain byte-identical. Shift-JIS wire encoding still applies (ASCII/kana/CJK only). Raviente world-wide broadcasts stay on the server default since they have no single session.
-- Localized quest text (phase B of [#188](https://github.com/Mezeporta/Erupe/issues/188)): quest JSON `title`, `description`, `text_main`, `text_sub_a`, `text_sub_b`, `success_cond`, `fail_cond`, and `contractor` now accept either a plain string (existing behaviour, single-language) or a language-keyed object like `{"jp": "...", "en": "...", "fr": "..."}`. `CompileQuestJSON` takes the requesting session's language and resolves each field with a fallback chain (requested → plain → jp → en → any non-empty). The quest cache is now keyed by `(questID, language)` so compiled binaries for different languages never leak between sessions. `ParseQuestBinary` emits plain strings unchanged, so round-tripping existing `.bin` files through the JSON path produces byte-identical output. New `LocalizedString` type is reusable for phase C (scenarios, mail, shop). Shift-JIS encoding limits still apply — localized strings must use characters representable in Shift-JIS (ASCII, kana, CJK).
-- Per-session language preference (phase A of [#188](https://github.com/Mezeporta/Erupe/issues/188)): new `users.language` column (migration `0022_user_language`), `UserRepo.GetLanguage`/`SetLanguage`, `Session.Lang()`/`SetLang()` accessors, and a `!lang <en|jp|fr|es>` command to show or change the session's language live. The preference is loaded on login and persisted across sessions; an empty value falls back to `config.Language`. The `getLangStringsFor(code)` primitive is the new way to resolve an i18n table from a concrete code — existing callers keep working via the unchanged `getLangStrings(server)` wrapper. This is plumbing only: localized quest/scenario content comes in phase B.
 
 ### Changed