Merge "Fix UI problem in system language list" into udc-dev

        <Button

            android:id="@+id/add_language"

            android:layout_width="match_parent"

            android:layout_height="?android:listPreferredItemHeight"

            android:layout_height="wrap_content"

            android:paddingStart="?android:attr/listPreferredItemPaddingStart"

            android:paddingEnd="?android:attr/listPreferredItemPaddingEnd"

            android:drawableStart="@drawable/ic_add_24dp"