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/text_edit.cpp

@@ -3034,6 +3034,7 @@ Variant TextEdit::get_drag_data(const Point2 &p_point) {
 	if (has_selection() && selection_drag_attempt) {
 		String t = get_selected_text();
 		Label *l = memnew(Label);
+		l->set_auto_translate_mode(AUTO_TRANSLATE_MODE_DISABLED); // Don't translate user input.
 		l->set_text(t);
 		set_drag_preview(l);
 		return t;