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_format_table.cpp

@@ -125,6 +125,7 @@ constexpr FormatMagicEntry kFormats[] = {
     {{'W','C','F','G'}, ".wcfg",  "server",    "--info-wcfg",      "Server config catalog"},
     {{'W','A','N','V'}, ".wanv",  "events",    "--info-wanv",      "Anniversary & recurring event catalog"},
     {{'W','P','R','G'}, ".wprg",  "pvp",       "--info-wprg",      "PvP ranking grades catalog"},
+    {{'W','L','A','N'}, ".wlan",  "i18n",      "--info-wlan",      "Localization catalog"},
     {{'W','F','A','C'}, ".wfac",  "factions",  nullptr,            "Faction catalog"},
     {{'W','L','C','K'}, ".wlck",  "locks",     nullptr,            "Lock catalog"},
     {{'W','S','K','L'}, ".wskl",  "skills",    nullptr,            "Skill catalog"},