Add logger (unused), more interface and language string updates, fix …

…some more bugs

FriishProduce/MainForm.cs

@@ -327,7 +327,7 @@ public void TabChanged(object sender, EventArgs e)
                 import_game_file.Text = string.Format(Program.Lang.String(import_game_file.Tag.ToString(), Name), (tabControl.SelectedForm as ProjectForm).FileTypeName);
             }
 
-            import_game_file.Enabled = close_project.Enabled = hasTabs;
+            import_game_file.Enabled = close_all.Enabled = close_project.Enabled = hasTabs;
 
             // Sync toolbar buttons
             // ********
@@ -404,6 +404,17 @@ private void TabContextMenu_Opening(object sender, CancelEventArgs e)
 
         private void CloseTab_Click(object sender, EventArgs e) { var tab = tabControl.SelectedForm as Form; tab?.Close(); }
 
+        private void CloseAll_Click(object sender, EventArgs e)
+        {
+            List<Form> list = new();
+
+            for (int i = 0; i < tabControl.TabPages.Count; i++)
+                list.Add(tabControl.TabPages[i].Form as Form);
+
+            foreach (var tab in list)
+                tab.Close();
+        }
+
         private void About_Click(object sender, EventArgs e) { using var about = new About(); about.ShowDialog(); }
 
         private void MenuItem_Exit_Click(object sender, EventArgs e) => Application.Exit();