Add ILang interface for language plugin text access

app/MindWork AI Studio/Tools/PluginSystem/ILang.cs

@@ -0,0 +1,21 @@
+namespace AIStudio.Tools.PluginSystem;
+
+/// <summary>
+/// Represents a contract to access text from a language plugin.
+/// </summary>
+public interface ILang
+{
+    /// <summary>
+    /// Tries to get a text from the language plugin.
+    /// </summary>
+    /// <remarks>
+    /// The given fallback text is used to determine the key for
+    /// the language plugin. Base for the key is the namespace of
+    /// the using component and the fallback text in English (US).
+    /// The given text getting hashed. When the key does not exist,
+    /// the fallback text will be returned.
+    /// </remarks>
+    /// <param name="fallbackEN">The fallback text in English (US).</param>
+    /// <returns>The text from the language plugin or the fallback text.</returns>
+    public string T(string fallbackEN);
+}