Add posterization strings into en.json

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

@@ -848,6 +848,11 @@
   "TYPE": "Type",
   "EFFECTS": "Effects",
   "OUTLINE_NODE": "Outline",
+  "POSTERIZATION_NODE": "Posterization",
+  "RGB_POSTERIZATION_MODE": "RGB",
+  "LUMINANCE_POSTERIZATION_MODE": "Luminance",
+  "LEVELS": "Levels",
+  "USE_DOCUMENT_COLOR_SPACE": "Use document color space",
   "SHADER_CODE": "Shader Code",
   "SHADER_NODE": "Shader",
   "FAILED_TO_OPEN_EDITABLE_STRING_TITLE": "Failed to open file",

src/PixiEditor/ViewModels/Document/Nodes/Effects/PosterizationNodeViewModel.cs

@@ -3,7 +3,7 @@ using PixiEditor.ViewModels.Nodes;
 
 namespace PixiEditor.ViewModels.Document.Nodes.Effects;
 
-[NodeViewModel("POSTERIZATION_NODE", "EFFECTS", PixiPerfectIcons.Outline)]
+[NodeViewModel("POSTERIZATION_NODE", "EFFECTS", PixiPerfectIcons.ColorPalette)]
 internal class PosterizationNodeViewModel : NodeViewModel<PosterizationNode>
 {