Use "PSU" label to fit on screen

Marlin/language_el.h

@@ -199,7 +199,7 @@
 #endif
 #define MSG_INFO_MIN_TEMP                   _UxGT("Min Temp")
 #define MSG_INFO_MAX_TEMP                   _UxGT("Max Temp")
-#define MSG_INFO_PSU                        _UxGT("Power Supply")
+#define MSG_INFO_PSU                        _UxGT("PSU")
 
 #define MSG_FILAMENT_CHANGE_HEADER          _UxGT("CHANGE FILAMENT")
 #define MSG_FILAMENT_CHANGE_OPTION_EXTRUDE  _UxGT("Extrude more")

Marlin/language_en.h

@@ -820,7 +820,7 @@
   #define MSG_INFO_MAX_TEMP                   _UxGT("Max Temp")
 #endif
 #ifndef MSG_INFO_PSU
-  #define MSG_INFO_PSU                        _UxGT("Power Supply")
+  #define MSG_INFO_PSU                        _UxGT("PSU")
 #endif
 #ifndef MSG_DRIVE_STRENGTH
   #define MSG_DRIVE_STRENGTH                  _UxGT("Drive Strength")

Marlin/language_nl.h

@@ -220,7 +220,7 @@
 
 #define MSG_INFO_MIN_TEMP                   _UxGT("Min Temp")
 #define MSG_INFO_MAX_TEMP                   _UxGT("Max Temp")
-#define MSG_INFO_PSU                        _UxGT("Power Supply")  //accepted English term in Dutch
+#define MSG_INFO_PSU                        _UxGT("PSU")  //accepted English term in Dutch
 
 #define MSG_DRIVE_STRENGTH                  _UxGT("Motorstroom")
 #define MSG_DAC_PERCENT                     _UxGT("Driver %")  //accepted English term in Dutch