Simplify home_z_safely, respect HOME_AFTER_DEACTIVATE

Marlin/src/core/language.h

Marlin/src/gcode/calibrate/G28.cpp

Marlin/src/lcd/language/language_an.h

Marlin/src/lcd/language/language_ca.h

Marlin/src/lcd/language/language_cz.h

Marlin/src/lcd/language/language_da.h

Marlin/src/lcd/language/language_de.h

Marlin/src/lcd/language/language_en.h

Marlin/src/lcd/language/language_es.h

Marlin/src/lcd/language/language_eu.h

Marlin/src/lcd/language/language_fr.h

Marlin/src/lcd/language/language_gl.h

Marlin/src/lcd/language/language_hu.h

Marlin/src/lcd/language/language_it.h

Marlin/src/lcd/language/language_jp_kana.h

Marlin/src/lcd/language/language_nl.h

Marlin/src/lcd/language/language_pl.h

Marlin/src/lcd/language/language_pt_br.h

Marlin/src/lcd/language/language_ro.h

Marlin/src/lcd/language/language_ru.h