Set auto translate mode for drag previews

- Controls
  - `LineEdit`, `TextEdit`: Always disabled since it's dragging user input.
  - `TabBar`: Use the same auto translate mode as the node.
  - `RichTextLabel`: Always disable since auto translation is done
    differently from other controls (selection text you get
    programmatically is always after auto translation).
- Editor
  - Disable drag preview auto translation if the text is user input,
    filename, or class name.
  - Also disabled unexpected auto translation for audio bus effect names.

scene/gui/tab_bar.cpp

@@ -1250,6 +1250,7 @@ Variant TabBar::_handle_get_drag_data(const String &p_type, const Point2 &p_poin
 	}
 
 	Label *label = memnew(Label(get_tab_title(tab_over)));
+	label->set_auto_translate_mode(get_auto_translate_mode()); // Reflect how the title is displayed.
 	drag_preview->add_child(label);
 
 	set_drag_preview(drag_preview);