diff --git a/Source/Editor/CustomEditors/Dedicated/LocalizationSettingsEditor.cs b/Source/Editor/CustomEditors/Dedicated/LocalizationSettingsEditor.cs
index ea56c7630..521b844ec 100644
--- a/Source/Editor/CustomEditors/Dedicated/LocalizationSettingsEditor.cs
+++ b/Source/Editor/CustomEditors/Dedicated/LocalizationSettingsEditor.cs
@@ -353,7 +353,7 @@ namespace FlaxEditor.CustomEditors.Dedicated
             }
         }
 
-        private static void FindNewKeysJson(string file, Dictionary<string, string> newKeys, HashSet<string> allKeys, JToken token)
+        private static void FindNewKeysJson(Dictionary<string, string> newKeys, HashSet<string> allKeys, JToken token)
         {
             if (token is JObject o)
             {
@@ -377,14 +377,14 @@ namespace FlaxEditor.CustomEditors.Dedicated
                             }
                         }
                     }
-                    FindNewKeysJson(file, newKeys, allKeys, p.Value);
+                    FindNewKeysJson(newKeys, allKeys, p.Value);
                 }
             }
             else if (token is JArray a)
             {
                 foreach (var p in a)
                 {
-                    FindNewKeysJson(file, newKeys, allKeys, p);
+                    FindNewKeysJson(newKeys, allKeys, p);
                 }
             }
         }
@@ -395,7 +395,7 @@ namespace FlaxEditor.CustomEditors.Dedicated
             using (var jsonReader = new JsonTextReader(reader))
             {
                 var token = JToken.ReadFrom(jsonReader);
-                FindNewKeysJson(file, newKeys, allKeys, token);
+                FindNewKeysJson(newKeys, allKeys, token);
             }
         }
 
diff --git a/Source/Editor/CustomEditors/Editors/LocalizedStringEditor.cs b/Source/Editor/CustomEditors/Editors/LocalizedStringEditor.cs
index 0f93df70b..82503d9bc 100644
--- a/Source/Editor/CustomEditors/Editors/LocalizedStringEditor.cs
+++ b/Source/Editor/CustomEditors/Editors/LocalizedStringEditor.cs
@@ -30,9 +30,9 @@ namespace FlaxEditor.CustomEditors.Editors
         {
             base.Initialize(layout);
 
-            if (layout.Children.Count != 1)
+            if (layout.Children.Count == 0)
                 return;
-            var propList = layout.Children[0] as PropertiesListElement;
+            var propList = layout.Children[layout.Children.Count - 1] as PropertiesListElement;
             if (propList == null || propList.Children.Count != 2)
                 return;
             var idElement = propList.Children[0] as TextBoxElement;
@@ -66,6 +66,7 @@ namespace FlaxEditor.CustomEditors.Editors
                 Text = "+",
                 TooltipText = "Add new localized text to Localization Settings (all used locales)",
                 Parent = _valueElement.TextBox,
+                Enabled = IsSingleObject,
             };
             addString.SetAnchorPreset(AnchorPresets.MiddleRight, false, true);
             addString.ButtonClicked += OnAddStringClicked;
@@ -175,6 +176,7 @@ namespace FlaxEditor.CustomEditors.Editors
                         allKeys.Add(e.Key);
                 }
             }
+            _valueElement.TextBox.SetTextAsUser(null);
             string newKey = null;
             if (string.IsNullOrEmpty(_idElement.Text))
             {
diff --git a/Source/Engine/Localization/LocalizedString.cs b/Source/Engine/Localization/LocalizedString.cs
index 9d7dc7720..2d6535336 100644
--- a/Source/Engine/Localization/LocalizedString.cs
+++ b/Source/Engine/Localization/LocalizedString.cs
@@ -51,7 +51,9 @@ namespace FlaxEngine
         /// <returns>The string.</returns>
         public static implicit operator string(LocalizedString str)
         {
-            return str.ToString();
+            if ((object)str == null)
+                return null;
+            return string.IsNullOrEmpty(str.Value) ? Localization.GetString(str.Id) : str.Value;
         }
 
         /// <summary>
@@ -61,9 +63,35 @@ namespace FlaxEngine
         /// <returns>The localized string.</returns>
         public static implicit operator LocalizedString(string str)
         {
+            if (str == null)
+                return null;
             return new LocalizedString(str);
         }
 
+        /// <summary>
+        /// Compares two localized strings.
+        /// </summary>
+        /// <param name="left">The lft string.</param>
+        /// <param name="right">The right string.</param>
+        /// <returns>True if both values are equal, otherwise false.</returns>
+        public static bool operator ==(LocalizedString left, LocalizedString right)
+        {
+            return left?.Equals(right) ?? (object)right == null;
+        }
+
+        /// <summary>
+        /// Compares two localized strings.
+        /// </summary>
+        /// <param name="left">The lft string.</param>
+        /// <param name="right">The right string.</param>
+        /// <returns>True if both values are not equal, otherwise false.</returns>
+        public static bool operator !=(LocalizedString left, LocalizedString right)
+        {
+            if ((object)left == null)
+                return (object)right != null;
+            return !left.Equals(right);
+        }
+
         /// <inheritdoc />
         public int CompareTo(object obj)
         {
@@ -77,7 +105,7 @@ namespace FlaxEngine
         /// <inheritdoc />
         public bool Equals(LocalizedString other)
         {
-            return Id == other.Id && Value == other.Value;
+            return (object)other != null && Id == other.Id && Value == other.Value;
         }
 
         /// <inheritdoc />
@@ -101,7 +129,7 @@ namespace FlaxEngine
         /// <inheritdoc />
         public override bool Equals(object obj)
         {
-            return ReferenceEquals(this, obj) || obj is LocalizedString other && Equals(other);
+            return (object)this == (object)obj || obj is LocalizedString other && Equals(other);
         }
 
         /// <inheritdoc />
diff --git a/Source/Engine/UI/GUI/Common/Button.cs b/Source/Engine/UI/GUI/Common/Button.cs
index 639552ec3..51d115780 100644
--- a/Source/Engine/UI/GUI/Common/Button.cs
+++ b/Source/Engine/UI/GUI/Common/Button.cs
@@ -24,11 +24,20 @@ namespace FlaxEngine.GUI
         /// </summary>
         protected FontReference _font;
 
+        /// <summary>
+        /// The text.
+        /// </summary>
+        protected LocalizedString _text;
+
         /// <summary>
         /// Button text property.
         /// </summary>
         [EditorOrder(10), Tooltip("The button label text.")]
-        public string Text { get; set; }
+        public LocalizedString Text
+        {
+            get => _text;
+            set => _text = value;
+        }
 
         /// <summary>
         /// Gets or sets the font used to draw button text.
@@ -201,7 +210,7 @@ namespace FlaxEngine.GUI
             Render2D.DrawRectangle(clientRect, borderColor);
 
             // Draw text
-            Render2D.DrawText(_font.GetFont(), TextMaterial, Text, clientRect, textColor, TextAlignment.Center, TextAlignment.Center);
+            Render2D.DrawText(_font.GetFont(), TextMaterial, _text, clientRect, textColor, TextAlignment.Center, TextAlignment.Center);
         }
 
         /// <inheritdoc />
diff --git a/Source/Engine/UI/GUI/Common/Dropdown.cs b/Source/Engine/UI/GUI/Common/Dropdown.cs
index 3bb00990f..ea2debb4a 100644
--- a/Source/Engine/UI/GUI/Common/Dropdown.cs
+++ b/Source/Engine/UI/GUI/Common/Dropdown.cs
@@ -77,7 +77,7 @@ namespace FlaxEngine.GUI
         /// <summary>
         /// The items.
         /// </summary>
-        protected List<string> _items = new List<string>();
+        protected List<LocalizedString> _items = new List<LocalizedString>();
 
         /// <summary>
         /// The popup menu. May be null if has not been used yet.
@@ -95,7 +95,7 @@ namespace FlaxEngine.GUI
         /// Gets or sets the items collection.
         /// </summary>
         [EditorOrder(1), Tooltip("The items collection.")]
-        public List<string> Items
+        public List<LocalizedString> Items
         {
             get => _items;
             set => _items = value;
@@ -107,7 +107,17 @@ namespace FlaxEngine.GUI
         [HideInEditor, NoSerialize]
         public string SelectedItem
         {
-            get => _selectedIndex != -1 ? _items[_selectedIndex] : string.Empty;
+            get => _selectedIndex != -1 ? _items[_selectedIndex].ToString() : string.Empty;
+            set => SelectedIndex = _items.IndexOf(value);
+        }
+
+        /// <summary>
+        /// Gets or sets the selected item (returns <see cref="LocalizedString.Empty"/> if no item is being selected).
+        /// </summary>
+        [HideInEditor, NoSerialize]
+        public LocalizedString SelectedItemLocalized
+        {
+            get => _selectedIndex != -1 ? _items[_selectedIndex] : LocalizedString.Empty;
             set => SelectedIndex = _items.IndexOf(value);
         }
 
@@ -265,7 +275,8 @@ namespace FlaxEngine.GUI
         /// <param name="items">The items.</param>
         public void AddItems(IEnumerable<string> items)
         {
-            _items.AddRange(items);
+            foreach (var item in items)
+                _items.Add(item);
         }
 
         /// <summary>
@@ -276,7 +287,8 @@ namespace FlaxEngine.GUI
         {
             SelectedIndex = -1;
             _items.Clear();
-            _items.AddRange(items);
+            foreach (var item in items)
+                _items.Add(item);
         }
 
         /// <summary>
diff --git a/Source/Engine/UI/GUI/Common/Label.cs b/Source/Engine/UI/GUI/Common/Label.cs
index 196bbb2b6..e935cd0eb 100644
--- a/Source/Engine/UI/GUI/Common/Label.cs
+++ b/Source/Engine/UI/GUI/Common/Label.cs
@@ -10,7 +10,11 @@ namespace FlaxEngine.GUI
     /// <seealso cref="FlaxEngine.GUI.ContainerControl" />
     public class Label : ContainerControl
     {
-        private string _text;
+        /// <summary>
+        /// The text.
+        /// </summary>
+        protected LocalizedString _text;
+
         private bool _autoWidth;
         private bool _autoHeight;
         private bool _autoFitText;
@@ -26,7 +30,7 @@ namespace FlaxEngine.GUI
         /// Gets or sets the text.
         /// </summary>
         [EditorOrder(10), MultilineText, Tooltip("The label text.")]
-        public string Text
+        public LocalizedString Text
         {
             get => _text;
             set
@@ -225,18 +229,7 @@ namespace FlaxEngine.GUI
                 }
             }
 
-            Render2D.DrawText(
-                _font.GetFont(),
-                Material,
-                Text,
-                rect,
-                color,
-                hAlignment,
-                wAlignment,
-                Wrapping,
-                1.0f,
-                scale
-            );
+            Render2D.DrawText(_font.GetFont(), Material, _text, rect, color, hAlignment, wAlignment, Wrapping, 1.0f, scale);
 
             if (ClipText)
                 Render2D.PopClip();
diff --git a/Source/Engine/UI/GUI/Common/TextBox.cs b/Source/Engine/UI/GUI/Common/TextBox.cs
index 0ed5c731c..20548eed8 100644
--- a/Source/Engine/UI/GUI/Common/TextBox.cs
+++ b/Source/Engine/UI/GUI/Common/TextBox.cs
@@ -9,11 +9,20 @@ namespace FlaxEngine.GUI
     {
         private TextLayoutOptions _layout;
 
+        /// <summary>
+        /// The watermark text.
+        /// </summary>
+        protected LocalizedString _watermarkText;
+
         /// <summary>
         /// Gets or sets the watermark text to show grayed when textbox is empty.
         /// </summary>
         [EditorOrder(20), Tooltip("The watermark text to show grayed when textbox is empty.")]
-        public string WatermarkText { get; set; }
+        public LocalizedString WatermarkText
+        {
+            get => _watermarkText;
+            set => _watermarkText = value;
+        }
 
         /// <summary>
         /// Gets or sets the text wrapping within the control bounds.
@@ -201,9 +210,9 @@ namespace FlaxEngine.GUI
                     color *= 0.6f;
                 Render2D.DrawText(font, _text, color, ref _layout, TextMaterial);
             }
-            else if (!string.IsNullOrEmpty(WatermarkText) && !IsFocused)
+            else if (!string.IsNullOrEmpty(_watermarkText) && !IsFocused)
             {
-                Render2D.DrawText(font, WatermarkText, WatermarkTextColor, ref _layout, TextMaterial);
+                Render2D.DrawText(font, _watermarkText, WatermarkTextColor, ref _layout, TextMaterial);
             }
 
             // Caret