Multi-language support (#15453)

Marlin/src/Marlin.cpp

Marlin/src/Marlin.h

Marlin/src/core/language.h

Marlin/src/core/multi_language.cpp

Marlin/src/core/multi_language.h

Marlin/src/feature/bedlevel/ubl/ubl_G29.cpp

Marlin/src/feature/pause.cpp

Marlin/src/feature/power_loss_recovery.cpp

Marlin/src/feature/prusa_MMU2/mmu2.cpp

Marlin/src/feature/tmc_util.cpp

Marlin/src/gcode/bedlevel/G26.cpp

Marlin/src/gcode/bedlevel/abl/G29.cpp

Marlin/src/gcode/calibrate/G28.cpp

Marlin/src/gcode/calibrate/M48.cpp

Marlin/src/gcode/calibrate/M852.cpp

Marlin/src/gcode/config/M43.cpp

Marlin/src/gcode/control/M108_M112_M410.cpp

Marlin/src/gcode/control/M80_M81.cpp

Marlin/src/gcode/geometry/M206_M428.cpp

Marlin/src/gcode/host/M16.cpp