Update German language, (c) (#14804)

Marlin/src/HAL/HAL_DUE/Tone.cpp

  * Based on Sprinter and grbl.
  * Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
  *
+ * SAMD51 HAL developed by Giuliano Zaro (AKA GMagician)
+ *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation, either version 3 of the License, or

Marlin/src/HAL/HAL_SAMD51/HAL.cpp

 /**
  * Marlin 3D Printer Firmware
  *
- * Copyright (C) 2019 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ * Copyright (c) 2019 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
  * SAMD51 HAL developed by Giuliano Zaro (AKA GMagician)
  *
  * This program is free software: you can redistribute it and/or modify

Marlin/src/HAL/HAL_SAMD51/HAL.h

 /**
  * Marlin 3D Printer Firmware
  *
- * Copyright (C) 2019 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ * Copyright (c) 2019 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
  * SAMD51 HAL developed by Giuliano Zaro (AKA GMagician)
  *
  * This program is free software: you can redistribute it and/or modify

Marlin/src/HAL/HAL_SAMD51/HAL_spi_SAMD51.cpp

 /**
  * Marlin 3D Printer Firmware
  *
- * Copyright (C) 2019 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ * Copyright (c) 2019 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
  * SAMD51 HAL developed by Giuliano Zaro (AKA GMagician)
  *
  * This program is free software: you can redistribute it and/or modify

Marlin/src/HAL/HAL_SAMD51/HAL_timers_SAMD51.cpp

 /**
  * Marlin 3D Printer Firmware
  *
- * Copyright (C) 2019 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ * Copyright (c) 2019 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
  * SAMD51 HAL developed by Giuliano Zaro (AKA GMagician)
  *
  * This program is free software: you can redistribute it and/or modify

Marlin/src/HAL/HAL_SAMD51/HAL_timers_SAMD51.h

 /**
  * Marlin 3D Printer Firmware
  *
- * Copyright (C) 2019 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ * Copyright (c) 2019 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
  * SAMD51 HAL developed by Giuliano Zaro (AKA GMagician)
  *
  * This program is free software: you can redistribute it and/or modify
 #define TEMP_TIMER_FREQUENCY   1000 // temperature interrupt frequency
 
 #define STEPPER_TIMER_RATE          HAL_TIMER_RATE   // frequency of stepper timer (HAL_TIMER_RATE / STEPPER_TIMER_PRESCALE)
-#define STEPPER_TIMER_TICKS_PER_US  ((STEPPER_TIMER_RATE) / 1000000) // stepper timer ticks per µs
+#define STEPPER_TIMER_TICKS_PER_US  ((STEPPER_TIMER_RATE) / 1000000) // stepper timer ticks per µs
 #define STEPPER_TIMER_PRESCALE      (CYCLES_PER_MICROSECOND / STEPPER_TIMER_TICKS_PER_US)
 
 #define PULSE_TIMER_RATE          STEPPER_TIMER_RATE

Marlin/src/HAL/HAL_SAMD51/MarlinSerial_AGCM4.cpp

 /**
  * Marlin 3D Printer Firmware
  *
- * Copyright (C) 2019 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ * Copyright (c) 2019 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
  * SAMD51 HAL developed by Giuliano Zaro (AKA GMagician)
  *
  * This program is free software: you can redistribute it and/or modify

Marlin/src/HAL/HAL_SAMD51/MarlinSerial_AGCM4.h

 /**
  * Marlin 3D Printer Firmware
  *
- * Copyright (C) 2019 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ * Copyright (c) 2019 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
  * SAMD51 HAL developed by Giuliano Zaro (AKA GMagician)
  *
  * This program is free software: you can redistribute it and/or modify

Marlin/src/HAL/HAL_SAMD51/SAMD51.h

 /**
  * Marlin 3D Printer Firmware
  *
- * Copyright (C) 2019 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ * Copyright (c) 2019 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
  * SAMD51 HAL developed by Giuliano Zaro (AKA GMagician)
  *
  * This program is free software: you can redistribute it and/or modify

Marlin/src/HAL/HAL_SAMD51/endstop_interrupts.h

 /**
  * Marlin 3D Printer Firmware
  *
- * Copyright (C) 2019 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ * Copyright (c) 2019 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
  * SAMD51 HAL developed by Giuliano Zaro (AKA GMagician)
  *
  * This program is free software: you can redistribute it and/or modify

Marlin/src/HAL/HAL_SAMD51/fastio_SAMD51.h

 /**
  * Marlin 3D Printer Firmware
  *
- * Copyright (C) 2019 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ * Copyright (c) 2019 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
  * SAMD51 HAL developed by Giuliano Zaro (AKA GMagician)
  *
  * This program is free software: you can redistribute it and/or modify

Marlin/src/HAL/HAL_SAMD51/inc/SanityCheck.h

 /**
  * Marlin 3D Printer Firmware
  *
- * Copyright (C) 2019 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ * Copyright (c) 2019 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
  * SAMD51 HAL developed by Giuliano Zaro (AKA GMagician)
  *
  * This program is free software: you can redistribute it and/or modify

Marlin/src/HAL/HAL_SAMD51/persistent_store_eeprom.cpp

 /**
  * Marlin 3D Printer Firmware
  *
- * Copyright (C) 2019 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ * Copyright (c) 2019 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
  * SAMD51 HAL developed by Giuliano Zaro (AKA GMagician)
  *
  * This program is free software: you can redistribute it and/or modify

Marlin/src/HAL/HAL_SAMD51/pinsDebug.h

 /**
  * Marlin 3D Printer Firmware
  *
- * Copyright (C) 2019 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ * Copyright (c) 2019 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
  * SAMD51 HAL developed by Giuliano Zaro (AKA GMagician)
  *
  * This program is free software: you can redistribute it and/or modify

Marlin/src/HAL/HAL_SAMD51/spi_pins.h

 /**
  * Marlin 3D Printer Firmware
  *
- * Copyright (C) 2019 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ * Copyright (c) 2019 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
  * SAMD51 HAL developed by Giuliano Zaro (AKA GMagician)
  *
  * This program is free software: you can redistribute it and/or modify

Marlin/src/HAL/HAL_SAMD51/watchdog_SAMD51.cpp

 /**
  * Marlin 3D Printer Firmware
  *
- * Copyright (C) 2019 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ * Copyright (c) 2019 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
  * SAMD51 HAL developed by Giuliano Zaro (AKA GMagician)
  *
  * This program is free software: you can redistribute it and/or modify

Marlin/src/HAL/HAL_SAMD51/watchdog_SAMD51.h

 /**
  * Marlin 3D Printer Firmware
  *
- * Copyright (C) 2019 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ * Copyright (c) 2019 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
  * SAMD51 HAL developed by Giuliano Zaro (AKA GMagician)
  *
  * This program is free software: you can redistribute it and/or modify

Marlin/src/lcd/language/language_de.h

 #define MSG_UBL_TOOLS                       _UxGT("UBL-Werkzeuge")
 #define MSG_UBL_LEVEL_BED                   _UxGT("Unified Bed Leveling")
 #define MSG_LCD_TILTING_MESH                _UxGT("Berührungspunkt")
+#define MSG_M48_TEST                        _UxGT("M48 Sondentest")
+#define MSG_M48_DEVIATION                   _UxGT("Abweichung")
 #define MSG_IDEX_MENU                       _UxGT("IDEX-Modus")
 #define MSG_OFFSETS_MENU                    _UxGT("Werkzeugversätze")
 #define MSG_IDEX_MODE_AUTOPARK              _UxGT("Autom. parken")
 #define MSG_VTOOLS_RESET                    _UxGT("V-Tools ist resetet")
 #define MSG_START_Z                         _UxGT("Z Start")
 #define MSG_END_Z                           _UxGT("Z Ende")
+#define MSG_GAMES                           _UxGT("Spiele")
 #define MSG_BRICKOUT                        _UxGT("Brickout")
 #define MSG_INVADERS                        _UxGT("Invaders")
 #define MSG_SNAKE                           _UxGT("Sn4k3")

Marlin/src/pins/stm32/pins_BIGTREE_SKR_E3_DIP.h

 /**
  * Marlin 3D Printer Firmware
- * Copyright (C) 2019 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ * Copyright (c) 2019 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
  *
  * Based on Sprinter and grbl.
- * Copyright (C) 2011 Camiel Gubbels / Erik van der Zalm
+ * Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
  *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by