Change posterization node display name to Posterize

src/PixiEditor/Data/Localization/Languages/en.json

@@ -848,6 +848,10 @@
     "TYPE": "Type",
     "EFFECTS": "Effects",
     "OUTLINE_NODE": "Outline",
+    "POSTERIZATION_NODE": "Posterize",
+    "RGB_POSTERIZATION_MODE": "RGB",
+    "LUMINANCE_POSTERIZATION_MODE": "Luminance",
+    "LEVELS": "Levels",
     "SHADER_CODE": "Shader Code",
     "SHADER_NODE": "Shader",
     "FAILED_TO_OPEN_EDITABLE_STRING_TITLE": "Failed to open file",