LCD PSU Control & language.h fixes

This has been tested with each of the 8 menu languages....

I have added two new defines to configuration.h

#define PSU_DEFAULT_ON  //  This define enables the user to choose
whether or not their Marlin controlled PSU (ATX / XBOX / Other?) is
turned on by default when Marlin starts up.  Leave uncommented to have
your PSU turned on (Marlin default)  Comment this define to leave your
PSU off.

//#define LCD_POWER_CONTROL  // This define adds LCD support for Marlin
controlled PSU's.  Uncomment this define to add LCD menu entries for
Power On / Off.

The following issues were detected during testing of my own changes.
They are corrected to the best of my ability.  I do not speak these
languages so corrections have been made using online translators or ,
worst case, best guess

#define MSG_RESUMING - missing from Polish, French, Spanish, Russian and
Portuguese.

#define MSG_TEMPERATURE - missing from French, Spanish, Italian and
Portuguese.

#define MSG_MOTION - missing from French, Spanish, Italian and
Portuguese.

#define MSG_Z_MAX - missing from Spanish.