Add languages list for neutral language option

src/Main/Base/Project/Src/Gui/Dialogs/OptionPanels/ProjectOptions/AssemblyInfo/AssemblyInfoPanel.xaml

@@ -20,6 +20,12 @@
 					<Setter Property="VerticalAlignment" Value="Center"/>
                     <Setter Property="Validation.ErrorTemplate" Value="{x:Null}"/>
 				</Style>
+				<Style TargetType="{x:Type ComboBox}">
+					<Setter Property="Height" Value="20"/>
+					<Setter Property="Margin" Value="4"/>
+					<Setter Property="VerticalAlignment" Value="Center"/>
+					<Setter Property="Validation.ErrorTemplate" Value="{x:Null}"/>
+				</Style>
 				<Style TargetType="{x:Type CheckBox}">
 					<Setter Property="Margin" Value="4"/>
 					<Setter Property="VerticalAlignment" Value="Center"/>
@@ -91,7 +97,9 @@
 			<Button Content="{core:Localize Dialog.ProjectOptions.AssemblyInfo.NewGUID}" Command="{Binding NewGuidCommand}" Grid.Column="2" Grid.Row="10"/>
 			
 			<Label Content="{core:Localize Dialog.ProjectOptions.AssemblyInfo.NeutralLanguage}" Grid.Column="0" Grid.Row="11"/>
-			<TextBox Text="{Binding NeutralLanguage, UpdateSourceTrigger=PropertyChanged}" Grid.Column="1" Grid.ColumnSpan="2" Grid.Row="11"/>
+			<ComboBox SelectedValue="{Binding NeutralLanguage, UpdateSourceTrigger=PropertyChanged}" ItemsSource="{Binding Languages}" 
+					  IsEditable="True" DisplayMemberPath="Value" SelectedValuePath="Key" 
+					  Grid.Column="1" Grid.ColumnSpan="2" Grid.Row="11"/>
 			
 			<CheckBox Content="{core:Localize Dialog.ProjectOptions.AssemblyInfo.MakeAssemblyCOMVisible}" 
 					IsChecked="{Binding ComVisible}" Grid.Column="0" Grid.ColumnSpan="2" Grid.Row="12"/>

src/Main/Base/Project/Src/Gui/Dialogs/OptionPanels/ProjectOptions/AssemblyInfo/AssemblyInfoProvider.cs

@@ -21,7 +21,6 @@ using System.IO;
 using System.Linq;
 using System.Reflection;
 using ICSharpCode.NRefactory.CSharp;
-using Mono.CSharp;
 using Attribute = ICSharpCode.NRefactory.CSharp.Attribute;
 using CSharpParser = ICSharpCode.NRefactory.CSharp.CSharpParser;
 

src/Main/Base/Project/Src/Gui/Dialogs/OptionPanels/ProjectOptions/AssemblyInfo/AssemblyInfoViewModel.cs

@@ -1,17 +1,32 @@
 using System;
+using System.Collections.Generic;
+using System.Globalization;
+using System.Linq;
 using System.Windows.Input;
+using ICSharpCode.Core;
 using ICSharpCode.SharpDevelop.Widgets;
 
 namespace ICSharpCode.SharpDevelop.Gui.OptionPanels
 {
 	public class AssemblyInfoViewModel : ViewModelBase
 	{
+		private const string NONE_LANGUAGE_CODE = "NONE";
+
 		private readonly AssemblyInfo assemblyInfo;
 
 		public AssemblyInfoViewModel(AssemblyInfo assemblyInfo)
 		{
 			this.assemblyInfo = assemblyInfo;
 			NewGuidCommand = new RelayCommand(() => Guid = System.Guid.NewGuid());
+
+			var cultures = CultureInfo.GetCultures(CultureTypes.AllCultures);
+
+			Languages = new Dictionary<string, string>();
+			Languages.Add(
+				NONE_LANGUAGE_CODE, 
+				string.Format("({0})", StringParser.Parse("${res:Dialog.Options.IDEOptions.TextEditor.Behaviour.IndentStyle.None}")));
+
+			Languages.AddRange(cultures.ToDictionary(x => x.Name, x => x.DisplayName).Distinct().OrderBy(x => x.Value));
 		}
 
 		public string Title
@@ -82,8 +97,17 @@ namespace ICSharpCode.SharpDevelop.Gui.OptionPanels
 
 		public string NeutralLanguage
 		{
-			get { return assemblyInfo.NeutralLanguage; }
-			set { assemblyInfo.NeutralLanguage = value; OnPropertyChanged(); }
+			get
+			{
+				return assemblyInfo.NeutralLanguage ?? NONE_LANGUAGE_CODE;
+			}
+
+			set
+			{
+				assemblyInfo.NeutralLanguage = value == NONE_LANGUAGE_CODE ? null : value;
+
+				OnPropertyChanged();
+			}
 		}
 
 		public bool ComVisible
@@ -110,6 +134,8 @@ namespace ICSharpCode.SharpDevelop.Gui.OptionPanels
 			set { assemblyInfo.JitTracking = value; OnPropertyChanged(); }
 		}
 
-		public ICommand NewGuidCommand { get; set; }
+		public ICommand NewGuidCommand { get; private set; }
+
+		public Dictionary<string, string> Languages { get; private set; } 
 	}
 }