Add support for importing .po files with strings localization

Source/Engine/ContentImporters/AssetsImportingManager.cpp

@@ -31,6 +31,7 @@
 #include "CreateParticleEmitterFunction.h"
 #include "CreateAnimationGraphFunction.h"
 #include "CreateVisualScript.h"
+#include "CreateJson.h"
 
 // Tags used to detect asset creation mode
 const String AssetsImportingManager::CreateTextureTag(TEXT("Texture"));
@@ -413,6 +414,9 @@ bool AssetsImportingManagerService::Init()
         { TEXT("gltf"), ASSET_FILES_EXTENSION, ImportModelFile::Import },
         { TEXT("glb"), ASSET_FILES_EXTENSION, ImportModelFile::Import },
 
+        // gettext PO files
+        { TEXT("po"), TEXT("json"), CreateJson::ImportPo },
+
         // Models (untested formats - may fail :/)
         { TEXT("blend"), ASSET_FILES_EXTENSION, ImportModelFile::Import },
         { TEXT("bvh"), ASSET_FILES_EXTENSION, ImportModelFile::Import },