Add project files.

Language/CulturesHelper.cs

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+using System;
+using System.Collections.Generic;
+using System.Globalization;
+using System.Linq;
+using System.Windows;
+
+namespace CMM.Language
+{
+    public class CulturesHelper
+    {
+        private bool _isFoundInstalledCultures = false;
+
+        const string LanguageFolder = "/Language;component";
+        const string ResourceLocalPath = "pack://application:,," + LanguageFolder;
+        const string LanguageFileName = "StringResources";
+
+        public List<CultureInfo> SupportedCultures { get; private set; } = new List<CultureInfo>();
+
+        public CulturesHelper() => Init();
+
+        private void Init()
+        {
+            if (!_isFoundInstalledCultures)
+            {
+                var cultureInfo = new CultureInfo("");
+
+                var Languages = GetAllLanguageResource();
+
+                GetAllLanguageResource().ForEach(file =>
+                {
+                    try
+                    {
+                        string cultureName = file.Substring(file.IndexOf(".") + 1).Replace(".xaml", "");
+
+                        cultureInfo = CultureInfo.GetCultureInfo(cultureName);
+
+                        if (cultureInfo != null)
+                        {
+                            SupportedCultures.Add(cultureInfo);
+                        }
+                    }
+                    catch (ArgumentException) { }
+                });
+
+                _isFoundInstalledCultures = true;
+            }
+        }
+
+        /// <summary>
+        /// 增加Language的XMAL檔
+        /// </summary>
+        private static List<string> GetAllLanguageResource()
+        {
+            var Languages = new List<string>();
+            string uriPath = ResourceLocalPath + "/" + LanguageFileName;
+
+            Languages.Add(uriPath + ".en-US.xaml");
+            Languages.Add(uriPath + ".zh-TW.xaml");
+
+            return Languages;
+        }
+
+        public void ChangeCulture(string cultureName)
+        {
+            var cultureInfo = CultureInfo.GetCultureInfo(cultureName);
+
+            if (cultureInfo != null)
+            {
+                ChangeCulture(cultureInfo);
+            }
+        }
+
+        /// <summary>
+        /// 切換語系
+        /// </summary>
+        public void ChangeCulture(CultureInfo culture)
+        {
+            if (SupportedCultures.Contains(culture))
+            {
+                var existsRD = Application.Current.Resources.MergedDictionaries
+                        .Where(x => x.Source.OriginalString.StartsWith(ResourceLocalPath, StringComparison.CurrentCultureIgnoreCase) ||
+                                    x.Source.OriginalString.StartsWith(LanguageFolder, StringComparison.CurrentCultureIgnoreCase))
+                        .FirstOrDefault();
+
+                if (existsRD == null) return;
+
+                var resourceFile = $"{ResourceLocalPath}/{LanguageFileName}.{culture.Name}.xaml";
+                var res = new ResourceDictionary()
+                {
+                    Source = new Uri(resourceFile, UriKind.Absolute)
+                };
+
+                Application.Current.Resources.MergedDictionaries.Remove(existsRD);
+                Application.Current.Resources.MergedDictionaries.Add(res);
+            }
+        }
+    }
+
+    public static class Lang
+    {
+        public static string Find(string key)
+        {
+            if (Application.Current == null) return null;
+
+            try
+            {
+                return (string)Application.Current.FindResource(key);
+            }
+            catch
+            {
+                return string.Empty;
+            }
+        }
+    }
+}

Language/Language.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+	<PropertyGroup>
+		<TargetFramework>net6.0-windows</TargetFramework>
+		<RootNamespace>CMM.Language</RootNamespace>
+		<ImplicitUsings>enable</ImplicitUsings>
+		<UseWPF>true</UseWPF>
+		<Product>ControlMyMonitorManagement</Product>
+	</PropertyGroup>
+
+	<PropertyGroup Condition="'$(Configuration)'=='Release'">
+		<Major>1</Major>
+		<Minor>0</Minor>
+		<ProjectStartedDate>$([System.DateTime]::op_Subtraction($([System.DateTime]::get_Now().get_Date()),$([System.DateTime]::new(2017,9,17))).get_TotalDays())</ProjectStartedDate>
+		<DaysSinceProjectStarted>$([System.DateTime]::Now.ToString(Hmm))</DaysSinceProjectStarted>
+		<DateTimeSuffix>$([System.DateTime]::Now.ToString(yyyyMMdd))</DateTimeSuffix>
+		<VersionSuffix>$(Major).$(Minor).$(ProjectStartedDate).$(DaysSinceProjectStarted)</VersionSuffix>
+		<AssemblyVersion Condition=" '$(DateTimeSuffix)' == '' ">0.0.0.1</AssemblyVersion>
+		<AssemblyVersion Condition=" '$(DateTimeSuffix)' != '' ">$(VersionSuffix)</AssemblyVersion>
+		<Version Condition=" '$(DateTimeSuffix)' == '' ">0.0.0.1</Version>
+		<Version Condition=" '$(DateTimeSuffix)' != '' ">$(DateTimeSuffix)</Version>
+	</PropertyGroup>
+
+	<ItemGroup>
+	  <None Update="StringResources.en-US.xaml">
+	    <Generator>MSBuild:Compile</Generator>
+	  </None>
+	  <None Update="StringResources.xaml">
+	    <Generator>MSBuild:Compile</Generator>
+	  </None>
+	  <None Update="StringResources.zh-TW.xam">
+	    <Generator>MSBuild:Compile</Generator>
+	  </None>
+	</ItemGroup>
+</Project>

Language/StringResources.en-US.xaml

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+<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+		            xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+                    xmlns:sys="clr-namespace:System;assembly=mscorlib">
+    
+</ResourceDictionary>

Language/StringResources.xaml

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+<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+		            xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+                    xmlns:sys="clr-namespace:System;assembly=mscorlib">
+    
+</ResourceDictionary>

Language/StringResources.zh-TW.xam

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+<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+		            xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+                    xmlns:sys="clr-namespace:System;assembly=mscorlib">
+    
+</ResourceDictionary>