Buttons for edit mode

...all/assets/de/tobias/playpad/assets/lang/ui_de.properties

...ts/de/tobias/playpad/assets/view/main/desktop/header.fxml

PlayWall/src/de/tobias/playpad/components/Keys.xml

...src/de/tobias/playpad/layout/desktop/DesktopEditMode.java

...bias/playpad/layout/desktop/DesktopMainLayoutConnect.java

...ypad/layout/desktop/DesktopMenuToolbarViewController.java

...tobias/playpad/layout/desktop/DesktopPadDragListener.java

.../src/de/tobias/playpad/layout/desktop/DesktopPadView.java

...bias/playpad/layout/desktop/DesktopPadViewController.java

.../tobias/playpad/layout/desktop/PageButtonDragHandler.java

...e/tobias/playpad/layout/touch/TouchPadViewController.java

...obias/playpad/viewcontroller/main/MainViewController.java

.../tobias/playpad/viewcontroller/pad/PadViewController.java

PlayWallCore/src/de/tobias/playpad/pad/view/IPadView.java