feat(editor): add WLAN (Localization) — 123rd open format

Novel replacement for the per-language overlay tables
vanilla WoW carried as Locale_*.MPQ patches plus the
Spell.dbc / Item.dbc trailing 16-locale string columns.
Each entry binds one (originalKey, languageCode,
namespace) triple to its localized translation,
forming a per-language overlay applied AFTER any
per-format catalog has resolved its primary text.

Eleven languageCode values cover the canonical WoW
locales (enUS / enGB / deDE / esES / frFR / itIT /
koKR / ptBR / ruRU / zhCN / zhTW) plus Unknown=255 as
escape hatch. Eight namespace values segment the
lookup space (UI / Quest / Item / Spell / Creature /
Tooltip / Gossip / System) so a UI button "Cancel"
doesn't collide with an item description containing
the word "Cancel".

UTF-8 multibyte support is the novel demonstration —
the originalKey field is typically ASCII (English
canonical key), but localizedText holds Korean (취소),
Simplified Chinese (取消), or other non-Latin scripts.
The string-length-prefixed binary serialization
preserves byte-identical round-trip regardless of
encoding.

Three preset emitters: makeUIBasics (5 UI translations
of the "Cancel" button across deDE/frFR/esES/koKR/zhCN
including the Korean and Chinese multibyte UTF-8 strings),
makeQuestSample (3 entries — one quest title in
deDE/frFR/koKR illustrating the dotted-key convention
"QUEST.123.title"), makeTooltipSet (4 item-tooltip
strings in deDE+frFR — the high-volume client
localization use case).

Validator's most novel check is per-(originalKey,
languageCode, namespace) triple uniqueness — two
entries with all three matching would tie at runtime
when the locale-aware text layer looks up an override.
Plus the warning on empty localizedText (the override
would render blank — possibly worse than fallback to
the catalog default).

Format count 122 -> 123. CLI flag count 1283 -> 1288.

tools/editor/cli_list_formats.cpp

@@ -147,6 +147,7 @@ constexpr FormatRow kFormats[] = {
     {"WCFG", ".wcfg",  "server",    "worldserver.conf flat-text config",  "Server config catalog (polymorphic Float/Int/Bool/String values)"},
     {"WANV", ".wanv",  "events",    "GameEvent SQL + per-holiday script", "Anniversary & recurring event catalog (cron-like scheduling)"},
     {"WPRG", ".wprg",  "pvp",       "vanilla 14-rank PvP ladder ladder",  "PvP ranking grades catalog (faction + tier + honor thresholds)"},
+    {"WLAN", ".wlan",  "i18n",      "Locale_*.MPQ + DBC trailing strings","Localization catalog (per-language string overlay)"},
 
     // Additional pipeline catalogs without the alternating
     // gen/info/validate CLI surface (loaded by the engine