Defined three charsets.

Marlin/Configuration.h

@@ -533,6 +533,12 @@ const bool Z_MAX_ENDSTOP_INVERTING = true; // set to true to invert the logic of
 #define ABS_PREHEAT_FAN_SPEED 255   // Insert Value between 0 and 255
 
 //LCD and SD support
+
+// Character based displays can have different extended charsets. If you see strange or missing characters on yours - try an other definition below.
+#define DISPLAY_CHARSET_HD44870_JAPAN  //  "ääööüüß°"
+//#define DISPLAY_CHARSET_HD44870_WESTERN // with better support for European languages. "ÄäÖöÜüß°"
+//#define DISPLAY_CHARSET_DOGM // for full graphics display "ÄäÖÖÜÜß°"
+
 //#define ULTRA_LCD  //general LCD support, also 16x2
 //#define DOGLCD  // Support for SPI LCD 128x64 (Controller ST7565R graphic Display Family)
 //#define SDSUPPORT // Enable SD Card Support in Hardware Console