diff --git a/src/common/engine/d_event.cpp b/src/common/engine/d_event.cpp
index f851bb49e..6458500b1 100644
--- a/src/common/engine/d_event.cpp
+++ b/src/common/engine/d_event.cpp
@@ -94,7 +94,7 @@ void D_ProcessEvents (void)
 				continue;				// menu ate the event
 		}
 
-		if (G_Responder(ev) && ev->type == EV_KeyDown) keywasdown.Set(ev->data1);
+		if (sysCallbacks.G_Responder(ev) && ev->type == EV_KeyDown) keywasdown.Set(ev->data1);
 	}
 
 	for (auto& ev: delayedevents)
diff --git a/src/common/engine/i_interface.h b/src/common/engine/i_interface.h
index caea1c7c2..d08eb859a 100644
--- a/src/common/engine/i_interface.h
+++ b/src/common/engine/i_interface.h
@@ -7,10 +7,12 @@
 struct event_t;
 class FRenderState;
 class FGameTexture;
+class FTextureID;
 enum EUpscaleFlags : int;
 
 struct SystemCallbacks
 {
+	bool (*G_Responder)(event_t* ev);	// this MUST be set, otherwise nothing will work
 	bool (*WantGuiCapture)();
 	bool (*WantLeftButton)();
 	bool (*NetGame)();
@@ -41,6 +43,7 @@ struct SystemCallbacks
 	bool (*SetSpecialMenu)(FName& menu, int param);
 	void (*OnMenuOpen)(bool makesound);
 	void (*LanguageChanged)(const char*);
+	bool (*OkForLocalization)(FTextureID, const char*);
 };
 
 extern SystemCallbacks sysCallbacks;
diff --git a/src/common/menu/menu.cpp b/src/common/menu/menu.cpp
index 05b7dac86..187fe5e9e 100644
--- a/src/common/menu/menu.cpp
+++ b/src/common/menu/menu.cpp
@@ -111,8 +111,6 @@ extern PClass *DefaultOptionMenuClass;
 #define KEY_REPEAT_DELAY	(GameTicRate*5/12)
 #define KEY_REPEAT_RATE		(3)
 
-bool OkForLocalization(FTextureID texnum, const char* substitute);
-
 //============================================================================
 //
 //
diff --git a/src/common/scripting/interface/vmnatives.cpp b/src/common/scripting/interface/vmnatives.cpp
index 842c85994..4a0d3758b 100644
--- a/src/common/scripting/interface/vmnatives.cpp
+++ b/src/common/scripting/interface/vmnatives.cpp
@@ -522,11 +522,9 @@ DEFINE_ACTION_FUNCTION_NATIVE(_TexMan, CheckRealHeight, CheckRealHeight)
 	ACTION_RETURN_INT(CheckRealHeight(texid));
 }
 
-bool OkForLocalization(FTextureID texnum, const char* substitute);
-
 static int OkForLocalization_(int index, const FString& substitute)
 {
-	return OkForLocalization(FSetTextureID(index), substitute);
+	return sysCallbacks.OkForLocalization? sysCallbacks.OkForLocalization(FSetTextureID(index), substitute) : false;
 }
 
 DEFINE_ACTION_FUNCTION_NATIVE(_TexMan, OkForLocalization, OkForLocalization_)
diff --git a/src/d_main.cpp b/src/d_main.cpp
index 93614148d..f8df99c24 100644
--- a/src/d_main.cpp
+++ b/src/d_main.cpp
@@ -178,6 +178,7 @@ void S_ParseMusInfo();
 void D_GrabCVarDefaults();
 void LoadHexFont(const char* filename);
 void InitBuildTiles();
+bool OkForLocalization(FTextureID texnum, const char* substitute);
 
 // PRIVATE FUNCTION PROTOTYPES ---------------------------------------------
 
@@ -3524,6 +3525,7 @@ static int D_DoomMain_Internal (void)
 	buttonMap.GetButton(Button_Klook)->bReleaseLock = true;
 
 	sysCallbacks = {
+		G_Responder,
 		System_WantGuiCapture,
 		System_WantLeftButton,
 		System_NetGame,
@@ -3554,6 +3556,8 @@ static int D_DoomMain_Internal (void)
 		M_SetSpecialMenu,
 		OnMenuOpen,
 		System_LanguageChanged,
+		OkForLocalization,
+
 	};