Load translation, SetLanguage command

.gitignore

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+bin/
+obj/
+/packages/
+riderModule.iml
+/_ReSharper.Caches/

Localization.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Localization", "Localization\Localization.csproj", "{E2169518-26AB-4DA6-ACB2-6BCFB35D6953}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{E2169518-26AB-4DA6-ACB2-6BCFB35D6953}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{E2169518-26AB-4DA6-ACB2-6BCFB35D6953}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{E2169518-26AB-4DA6-ACB2-6BCFB35D6953}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{E2169518-26AB-4DA6-ACB2-6BCFB35D6953}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+EndGlobal

Localization/Localization.csproj

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+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="4.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+    <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
+    <PropertyGroup>
+        <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
+        <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
+        <ProjectGuid>{E2169518-26AB-4DA6-ACB2-6BCFB35D6953}</ProjectGuid>
+        <OutputType>Library</OutputType>
+        <AppDesignerFolder>Properties</AppDesignerFolder>
+        <RootNamespace>Localization</RootNamespace>
+        <AssemblyName>Localization</AssemblyName>
+        <TargetFrameworkVersion>v4.8</TargetFrameworkVersion>
+        <FileAlignment>512</FileAlignment>
+    </PropertyGroup>
+    <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
+        <PlatformTarget>AnyCPU</PlatformTarget>
+        <DebugSymbols>true</DebugSymbols>
+        <DebugType>full</DebugType>
+        <Optimize>false</Optimize>
+        <OutputPath>bin\Debug\</OutputPath>
+        <DefineConstants>DEBUG;TRACE</DefineConstants>
+        <ErrorReport>prompt</ErrorReport>
+        <WarningLevel>4</WarningLevel>
+    </PropertyGroup>
+    <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
+        <PlatformTarget>AnyCPU</PlatformTarget>
+        <DebugType>pdbonly</DebugType>
+        <Optimize>true</Optimize>
+        <OutputPath>bin\Release\</OutputPath>
+        <DefineConstants>TRACE</DefineConstants>
+        <ErrorReport>prompt</ErrorReport>
+        <WarningLevel>4</WarningLevel>
+    </PropertyGroup>
+    <ItemGroup>
+        <Reference Include="0Harmony, Version=2.0.2.0, Culture=neutral, PublicKeyToken=null">
+          <HintPath>..\packages\Lib.Harmony.2.0.2\lib\net48\0Harmony.dll</HintPath>
+          <Private>True</Private>
+        </Reference>
+        <Reference Include="GamecraftModdingAPI, Version=1.6.0.0, Culture=neutral, PublicKeyToken=null">
+          <HintPath>..\..\GamecraftModdingAPI\GamecraftModdingAPI\bin\Debug\net472\GamecraftModdingAPI.dll</HintPath>
+        </Reference>
+        <Reference Include="IllusionPlugin, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null">
+          <HintPath>..\..\GamecraftModdingAPI\GamecraftModdingAPI\bin\Debug\net472\IllusionPlugin.dll</HintPath>
+        </Reference>
+        <Reference Include="Newtonsoft.Json, Version=12.0.0.0, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed">
+          <HintPath>..\..\ref\Gamecraft_Data\Managed\Newtonsoft.Json.dll</HintPath>
+        </Reference>
+        <Reference Include="RobocraftX.Common, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null">
+          <HintPath>..\..\ref\Gamecraft_Data\Managed\RobocraftX.Common.dll</HintPath>
+        </Reference>
+        <Reference Include="System" />
+        <Reference Include="System.Core" />
+        <Reference Include="System.Data" />
+        <Reference Include="System.Runtime.InteropServices.RuntimeInformation" />
+        <Reference Include="System.Xml" />
+    </ItemGroup>
+    <ItemGroup>
+        <Compile Include="LocalizationMod.cs" />
+        <Compile Include="Properties\AssemblyInfo.cs" />
+    </ItemGroup>
+    <ItemGroup>
+      <None Include="packages.config" />
+    </ItemGroup>
+    <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
+    <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 
+         Other similar extension points exist, see Microsoft.Common.targets.
+    <Target Name="BeforeBuild">
+    </Target>
+    <Target Name="AfterBuild">
+    </Target>
+    -->
+
+</Project>

Localization/LocalizationMod.cs

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+using System;
+using System.Collections.Generic;
+using System.IO;
+using GamecraftModdingAPI;
+using GamecraftModdingAPI.Commands;
+using GamecraftModdingAPI.Utility;
+using HarmonyLib;
+using IllusionPlugin;
+using Newtonsoft.Json;
+using Newtonsoft.Json.Linq;
+using ServiceLayer;
+
+namespace Localization
+{
+    public class LocalizationMod : IEnhancedPlugin
+    {
+        private readonly DirectoryInfo _pluginFolder = new DirectoryInfo(Path.Combine("Plugins", "Localization"));
+        public override void OnApplicationStart()
+        {
+            Main.Init();
+            if (!_pluginFolder.Exists)
+                _pluginFolder.Create();
+            string settingsPath = Path.Combine(_pluginFolder.FullName, "settings.json");
+            JObject settings;
+            if (File.Exists(settingsPath))
+            {
+                try
+                {
+                    using (var stream = new JsonTextReader(File.OpenText(settingsPath)))
+                        settings = JObject.Load(stream);
+                    string lang = (string) (settings["lang"] ?? (settings["lang"] = "en-us"));
+                    LoadTranslation(lang);
+                }
+                catch (Exception e)
+                {
+                    Logging.LogError(e);
+                    settings = new JObject();
+                }
+            }
+            else
+                settings = new JObject();
+
+            CommandBuilder.Builder("SetLanguage", "Sets the game's language")
+                .Action<string>(lang =>
+                {
+                    settings["lang"] = lang;
+                    using (var stream = new JsonTextWriter(new StreamWriter(File.OpenWrite(settingsPath))))
+                        settings.WriteTo(stream);
+                    LoadTranslation(lang);
+                    
+                }).Build();
+        }
+
+        public override void OnApplicationQuit()
+        {
+            Main.Shutdown();
+        }
+
+        private void LoadTranslation(string lang)
+        {
+            Logging.CommandLog("Loading translation for " + lang + "...");
+            string langPath = Path.Combine(_pluginFolder.FullName, lang + ".json");
+            if (!File.Exists(langPath))
+            {
+                Logging.CommandLogError("Could not find json file!");
+                return;
+            }
+
+            var strings = JsonConvert.DeserializeObject<Dictionary<string, string>>(File.ReadAllText(langPath));
+            var origStrings =
+                (Dictionary<string, string>) AccessTools.Field(typeof(LocalizationService), "LocalizedStrings")
+                    .GetValue(null);
+            foreach (var kv in strings)
+            {
+                if (!origStrings.Remove(kv.Key))
+                    Logging.CommandLogWarning(kv.Key + " wasn't in the original file.");
+                origStrings.Add(kv.Key, kv.Value);
+            }
+
+            Logging.CommandLog("Updated " + strings.Count + " strings (" + origStrings.Count + " strings in total)");
+        }
+
+        public override string Name { get; } = "LocalizationMod";
+        public override string Version { get; } = "1.0.0";
+    }
+}

Localization/Properties/AssemblyInfo.cs

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+using System.Reflection;
+using System.Runtime.InteropServices;
+
+// General Information about an assembly is controlled through the following 
+// set of attributes. Change these attribute values to modify the information
+// associated with an assembly.
+[assembly: AssemblyTitle("Localization")]
+[assembly: AssemblyDescription("")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("")]
+[assembly: AssemblyProduct("Localization")]
+[assembly: AssemblyCopyright("Copyright ©  2020")]
+[assembly: AssemblyTrademark("")]
+[assembly: AssemblyCulture("")]
+
+// Setting ComVisible to false makes the types in this assembly not visible 
+// to COM components.  If you need to access a type in this assembly from 
+// COM, set the ComVisible attribute to true on that type.
+[assembly: ComVisible(false)]
+
+// The following GUID is for the ID of the typelib if this project is exposed to COM
+[assembly: Guid("E2169518-26AB-4DA6-ACB2-6BCFB35D6953")]
+
+// Version information for an assembly consists of the following four values:
+//
+//      Major Version
+//      Minor Version 
+//      Build Number
+//      Revision
+//
+// You can specify all the values or you can default the Build and Revision Numbers 
+// by using the '*' as shown below:
+// [assembly: AssemblyVersion("1.0.*")]
+[assembly: AssemblyVersion("1.0.0.0")]
+[assembly: AssemblyFileVersion("1.0.0.0")]