Editor: Add some more translatable strings.

editor/plugins/script_text_editor.cpp

@@ -1230,7 +1230,7 @@ void ScriptTextEditor::drop_data_fw(const Point2 &p_point, const Variant &p_data
 		}
 
 		if (res->get_path().is_resource_file()) {
-			EditorNode::get_singleton()->show_warning("Only resources from filesystem can be dropped.");
+			EditorNode::get_singleton()->show_warning(TTR("Only resources from filesystem can be dropped."));
 			return;
 		}