Add project files.

src/framework/Elsa.Studio.Core/Localization/DefaultLocalizationProvider.cs

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+namespace Elsa.Studio.Localization;
+
+internal class DefaultLocalizationProvider : ILocalizationProvider
+{
+    public string GetTranslation(string key)
+    {
+        return key;
+    }
+}

src/framework/Elsa.Studio.Core/Localization/DefaultLocalizer.cs

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+using Microsoft.Extensions.Localization;
+
+namespace Elsa.Studio.Localization;
+
+/// <inheritdoc />
+public class DefaultLocalizer(ILocalizationProvider provider) : ILocalizer
+{
+    /// <inheritdoc />
+    public LocalizedString this[string key]
+    {
+        get
+        {
+            if (string.IsNullOrWhiteSpace(key))
+                return new LocalizedString(string.Empty, string.Empty, true);
+
+            var notFound = false;
+            var translation = provider.GetTranslation(key);
+
+            if (string.IsNullOrEmpty(translation))
+            {
+                translation = key;
+                notFound = true;
+            }
+
+            return new LocalizedString(key, translation, notFound);
+        }
+    }
+
+    /// <summary>
+    /// Gets the localized string with the specified key and formats it with the provided arguments.
+    /// </summary>
+    /// <param name="key">The key of the localized string.</param>
+    /// <param name="arguments">The arguments to format the localized string with.</param>
+    /// <returns>The localized string formatted with the provided arguments.</returns>
+    public LocalizedString this[string key, params object[] arguments]
+    {
+        get
+        {
+            if (string.IsNullOrWhiteSpace(key))
+                return new LocalizedString(string.Empty, string.Empty, true);
+
+            var notFound = false;
+            var translation = provider.GetTranslation(key);
+
+            if (string.IsNullOrEmpty(translation))
+            {
+                translation = string.Format(key, arguments);
+                notFound = true;
+            }
+            else
+            {
+                translation = string.Format(translation, arguments);
+            }
+
+            return new LocalizedString(key, translation, notFound);
+        }
+    }
+}

src/framework/Elsa.Studio.Core/Localization/ILocalizationProvider.cs

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+namespace Elsa.Studio.Localization;
+
+public interface ILocalizationProvider
+{
+    string GetTranslation(string key);
+}

src/framework/Elsa.Studio.Core/Localization/ILocalizer.cs

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+using Microsoft.Extensions.Localization;
+
+namespace Elsa.Studio.Localization;
+
+/// <summary>
+/// Interface for localization.
+/// </summary>
+public interface ILocalizer
+{
+    /// <summary>
+    /// Gets the localized string for the given key.
+    /// </summary>
+    /// <param name="key">The key for the localized string.</param>
+    LocalizedString this[string key] { get; }
+
+    /// <summary>
+    /// Gets the localized string for the given key and formats it with the provided arguments.
+    /// </summary>
+    /// <param name="key">The key for the localized string.</param>
+    /// <param name="arguments">The arguments to format the localized string with.</param>
+    LocalizedString this[string key, params object[] arguments] { get; }
+}