feat(windows64): add full language selection support with Russian localisation

## Language selection UI
- UIScene_SettingsOptionsMenu: enable _ENABLE_LANGUAGE_SELECT for _WINDOWS64
  so the Language button appears in the Settings menu on Windows
- UIScene_LanguageSelector.h: expose Simplified Chinese, Slovak and Czech
  language buttons on Windows64 (previously Durango-only)

## Windows64 XGetLanguage / XGetLocale implementation (Extrax64Stubs.cpp)
- Replace the stub XGetLanguage(){ return 1; } / XGetLocale(){ return 0; }
  with a real implementation that:
    1. First checks for an in-game override stored in GameSettingsA
       (SetMinecraftLanguage / SetMinecraftLocale)
    2. Falls back to GetUserDefaultLocaleName() and maps it to the
       appropriate XC_LANGUAGE_ / XC_LOCALE_ constant
  All locale regions (de-DE/AT/CH, fr-FR/CA/BE/CH, es-ES/MX/...,
  zh-CN/TW/HK, pt-PT/BR, no/nb/nn, nl-NL/BE, cs-CZ, sk-SK, el-GR,
  ru-RU, sv-SE, tr-TR, fi-FI, da-DK, ko-KR, ja-JP, it-IT, pl-PL)
  are handled.

## UIController.cpp fixes
- Fix typo _WINDOW64 -> _WINDOWS64 in reloadSkinThreadProc that caused
  NavigateBack() to be called after skin reload on Windows, crashing the game
- SetupFont(): always trigger eAppAction_ReloadFont when the font type is
  unchanged but the language changed (previously only triggered while in-game),
  so changing language from the main menu now refreshes the UI immediately

## Consoles_App.cpp
- getLocale(): add _WINDOWS64 to the #if guard for extended language support
  (Danish, Finnish, Czech, Slovak, Greek) so those locales resolve correctly

## Russian localisation (languages.loc + MediaWindows64.arc)
- Add IDS_LANG_SLOVAK (2286) and IDS_LANG_CZECH (2287) to strings.h
- Add Slovak and Czech display names to stringsLanguages.xml
- Build a complete Windows64-native Russian string block by mapping
  string names from Durango/Orbis/PS3/PSVita ru-RU XML files to the
  Windows64 integer IDs defined in strings.h (2283/2288 strings translated,
  remaining 5 use English fallback)
- Inject the ru-RU block into Windows64Media/Media/languages.loc and
  update Common/Media/MediaWindows64.arc accordingly

Minecraft.Client/Common/Consoles_App.cpp

@@ -9776,7 +9776,7 @@ void CMinecraftApp::getLocale(vector<wstring> &vecWstrLocales)
 		locales.push_back(eMCLang_zhCN);
 		break;
 
-#if defined __PS3__ || defined __ORBIS__ || defined __PSVITA__ || defined _DURANGO
+#if defined __PS3__ || defined __ORBIS__ || defined __PSVITA__ || defined _DURANGO || defined _WINDOWS64
 	case XC_LANGUAGE_DANISH:
 		locales.push_back(eMCLang_daDA);
 		locales.push_back(eMCLang_daDK);

Minecraft.Client/Common/UI/UIController.cpp

@@ -392,8 +392,8 @@ void UIController::SetupFont()
 
 	if (m_eTargetFont == m_eCurrentFont)
 	{
-		// 4J-JEV: If we're ingame, reload the font to update all the text.
-		if (app.GetGameStarted()) app.SetAction(ProfileManager.GetPrimaryPad(), eAppAction_ReloadFont);
+		// 4J-JEV: Font type unchanged but language changed - always reload UI to refresh strings.
+		app.SetAction(ProfileManager.GetPrimaryPad(), eAppAction_ReloadFont);
 		return;
 	}
 
@@ -708,7 +708,7 @@ int UIController::reloadSkinThreadProc(void* lpParam)
 	controller->m_groups[eUIGroup_Fullscreen]->ReloadAll();
 
 	// 4J Stu - Don't do this on windows, as we never navigated forwards to start with
-#ifndef _WINDOW64
+#ifndef _WINDOWS64
 	controller->NavigateBack(0, false, eUIScene_COUNT, eUILayer_Tooltips);
 #endif
 	LeaveCriticalSection(&ms_reloadSkinCS);

Minecraft.Client/Common/UI/UIScene_LanguageSelector.h

@@ -16,7 +16,7 @@
 #define HAS_LANGUAGE_KO_KR(exp)	exp,
 #define HAS_LANGUAGE_CN_TW(exp)	exp,
 
-#ifdef _DURANGO
+#if defined(_DURANGO) || defined(_WINDOWS64)
 #define HAS_LANGUAGE_CN_CN(exp)	exp,
 #define HAS_LANGUAGE_SK_SK(exp)	exp,
 #define HAS_LANGUAGE_CZ_CZ(exp)	exp,

Minecraft.Client/Common/UI/UIScene_SettingsOptionsMenu.cpp

@@ -2,7 +2,7 @@
 #include "UI.h"
 #include "UIScene_SettingsOptionsMenu.h"
 
-#if defined(_XBOX_ONE)
+#if defined(_XBOX_ONE) || defined(_WINDOWS64)
 #define _ENABLE_LANGUAGE_SELECT
 #endif
 

Minecraft.Client/Extrax64Stubs.cpp

@@ -544,8 +544,113 @@ void XMemDestroyDecompressionContext(XMEMDECOMPRESSION_CONTEXT Context)
 
 //#ifndef __PS3__
 #if !(defined _DURANGO || defined __PS3__ || defined __ORBIS__ || defined __PSVITA__)
+#ifdef _WINDOWS64
+DWORD XGetLanguage()
+{
+	// If the player has explicitly selected a language in-game, honour that override
+	unsigned char ucLang = app.GetMinecraftLanguage(0);
+	if (ucLang != MINECRAFT_LANGUAGE_DEFAULT) return ucLang;
+
+	// Otherwise detect the Windows UI language and map it to an XC_LANGUAGE_ constant
+	WCHAR wchLocaleName[LOCALE_NAME_MAX_LENGTH];
+	GetUserDefaultLocaleName(wchLocaleName, LOCALE_NAME_MAX_LENGTH);
+	eMCLang eLang = static_cast<eMCLang>(app.get_eMCLang(wchLocaleName));
+
+	switch (eLang)
+	{
+	case eMCLang_jaJP:
+		return XC_LANGUAGE_JAPANESE;
+	case eMCLang_deDE:
+	case eMCLang_deAT:
+	case eMCLang_deCH:
+		return XC_LANGUAGE_GERMAN;
+	case eMCLang_frFR:
+	case eMCLang_frCA:
+	case eMCLang_frBE:
+	case eMCLang_frCH:
+		return XC_LANGUAGE_FRENCH;
+	case eMCLang_esES:
+	case eMCLang_esMX:
+	case eMCLang_laLAS:
+	case eMCLang_esAR:
+	case eMCLang_esCL:
+	case eMCLang_esCO:
+	case eMCLang_esUS:
+		return XC_LANGUAGE_SPANISH;
+	case eMCLang_itIT:
+		return XC_LANGUAGE_ITALIAN;
+	case eMCLang_koKR:
+		return XC_LANGUAGE_KOREAN;
+	case eMCLang_zhCHT:
+	case eMCLang_zhHK:
+	case eMCLang_zhTW:
+	case eMCLang_hant:
+		return XC_LANGUAGE_TCHINESE;
+	case eMCLang_ptPT:
+	case eMCLang_ptBR:
+		return XC_LANGUAGE_PORTUGUESE;
+	case eMCLang_plPL:
+		return XC_LANGUAGE_POLISH;
+	case eMCLang_ruRU:
+		return XC_LANGUAGE_RUSSIAN;
+	case eMCLang_svSV:
+	case eMCLang_svSE:
+		return XC_LANGUAGE_SWEDISH;
+	case eMCLang_trTR:
+		return XC_LANGUAGE_TURKISH;
+	case eMCLang_nbNO:
+	case eMCLang_noNO:
+	case eMCLang_nnNO:
+		return XC_LANGUAGE_BNORWEGIAN;
+	case eMCLang_nlNL:
+	case eMCLang_nlBE:
+		return XC_LANGUAGE_DUTCH;
+	case eMCLang_zhCN:
+	case eMCLang_zhSG:
+	case eMCLang_hans:
+	case eMCLang_csCS:
+		return XC_LANGUAGE_SCHINESE;
+	case eMCLang_fiFI:
+		return XC_LANGUAGE_FINISH;
+	case eMCLang_daDA:
+	case eMCLang_daDK:
+		return XC_LANGUAGE_DANISH;
+	case eMCLang_csCZ:
+	case eMCLang_enCZ:
+		return XC_LANGUAGE_CZECH;
+	case eMCLang_skSK:
+	case eMCLang_enSK:
+		return XC_LANGUAGE_SLOVAK;
+	case eMCLang_elEL:
+	case eMCLang_elGR:
+	case eMCLang_enGR:
+		return XC_LANGUAGE_GREEK;
+	case eMCLang_enGB:
+	case eMCLang_enIE:
+	case eMCLang_enAU:
+	case eMCLang_enNZ:
+	case eMCLang_enCA:
+	case eMCLang_enUS:
+	default:
+		return XC_LANGUAGE_ENGLISH;
+	}
+}
+
+DWORD XGetLocale()
+{
+	// If the player has explicitly selected a locale in-game, honour that override
+	unsigned char ucLocale = app.GetMinecraftLocale(0);
+	if (ucLocale != MINECRAFT_LANGUAGE_DEFAULT) return ucLocale;
+
+	// Otherwise map the Windows UI locale to an XC_LOCALE_ constant
+	WCHAR wchLocaleName[LOCALE_NAME_MAX_LENGTH];
+	GetUserDefaultLocaleName(wchLocaleName, LOCALE_NAME_MAX_LENGTH);
+	return app.get_xcLang(wchLocaleName);
+}
+#else
 DWORD XGetLanguage() { return 1; }
 DWORD XGetLocale() { return 0; }
+#endif
 DWORD XEnableGuestSignin(BOOL fEnable) { return 0; }
 #endif
 

Minecraft.Client/Windows64Media/loc/stringsLanguages.xml

@@ -37,4 +37,6 @@
     <data name="IDS_LANG_GREEK">					<value>Greek</value>					</data>
 	
 	<data name="IDS_LANG_TURKISH">					<value>Turkish</value>					</data>
+	<data name="IDS_LANG_SLOVAK">					<value>Slovak</value>					</data>
+	<data name="IDS_LANG_CZECH">					<value>Czech</value>					</data>
 </root>

Minecraft.Client/Windows64Media/strings.h

@@ -2189,6 +2189,8 @@
 #define IDS_LANG_NORWEGIAN                                     2183
 #define IDS_LANG_GREEK                                         2184
 #define IDS_LANG_TURKISH                                       2185
+#define IDS_LANG_SLOVAK                                        2286
+#define IDS_LANG_CZECH                                         2287
 #define IDS_LEADERBOARD_KILLS_EASY                             2186
 #define IDS_LEADERBOARD_KILLS_NORMAL                           2187
 #define IDS_LEADERBOARD_KILLS_HARD                             2188