Replace "Override Language on NTSC Games" with "Allow Mismatched Region Settings"

This new setting is like Override Language on NTSC Games, except
instead of only applying to the GameCube language setting,
it also applies to the Wii language setting.

Fixes https://bugs.dolphin-emu.org/issues/11299

Source/Core/Core/Config/MainSettings.cpp

@@ -28,7 +28,8 @@ const ConfigInfo<bool> MAIN_SYNC_ON_SKIP_IDLE{{System::Main, "Core", "SyncOnSkip
 const ConfigInfo<std::string> MAIN_DEFAULT_ISO{{System::Main, "Core", "DefaultISO"}, ""};
 const ConfigInfo<bool> MAIN_ENABLE_CHEATS{{System::Main, "Core", "EnableCheats"}, false};
 const ConfigInfo<int> MAIN_GC_LANGUAGE{{System::Main, "Core", "SelectedLanguage"}, 0};
-const ConfigInfo<bool> MAIN_OVERRIDE_GC_LANGUAGE{{System::Main, "Core", "OverrideGCLang"}, false};
+const ConfigInfo<bool> MAIN_OVERRIDE_REGION_SETTINGS{
+    {System::Main, "Core", "OverrideRegionSettings"}, false};
 const ConfigInfo<bool> MAIN_DPL2_DECODER{{System::Main, "Core", "DPL2Decoder"}, false};
 const ConfigInfo<int> MAIN_AUDIO_LATENCY{{System::Main, "Core", "AudioLatency"}, 20};
 const ConfigInfo<bool> MAIN_AUDIO_STRETCH{{System::Main, "Core", "AudioStretch"}, false};

Source/Core/Core/Config/MainSettings.h

@@ -30,7 +30,7 @@ extern const ConfigInfo<bool> MAIN_SYNC_ON_SKIP_IDLE;
 extern const ConfigInfo<std::string> MAIN_DEFAULT_ISO;
 extern const ConfigInfo<bool> MAIN_ENABLE_CHEATS;
 extern const ConfigInfo<int> MAIN_GC_LANGUAGE;
-extern const ConfigInfo<bool> MAIN_OVERRIDE_GC_LANGUAGE;
+extern const ConfigInfo<bool> MAIN_OVERRIDE_REGION_SETTINGS;
 extern const ConfigInfo<bool> MAIN_DPL2_DECODER;
 extern const ConfigInfo<int> MAIN_AUDIO_LATENCY;
 extern const ConfigInfo<bool> MAIN_AUDIO_STRETCH;