Various typo fixes - only in comments, no code changes.

Marlin/ultralcd.cpp

@@ -38,7 +38,7 @@ char lcd_status_message[LCD_WIDTH+1] = WELCOME_MSG;
 #include "ultralcd_implementation_hitachi_HD44780.h"
 #endif
 
-/** forward declerations **/
+/** forward declarations **/
 
 void copy_and_scalePID_i();
 void copy_and_scalePID_d();
@@ -62,7 +62,7 @@ static void lcd_set_contrast();
 static void lcd_control_retract_menu();
 static void lcd_sdcard_menu();
 
-static void lcd_quick_feedback();//Cause an LCD refresh, and give the user visual or audiable feedback that something has happend
+static void lcd_quick_feedback();//Cause an LCD refresh, and give the user visual or audible feedback that something has happened
 
 /* Different types of actions that can be used in menu items. */
 static void menu_action_back(menuFunc_t data);
@@ -173,10 +173,10 @@ void* editValue;
 int32_t minEditValue, maxEditValue;
 menuFunc_t callbackFunc;
 
-// placeholders for Ki and Kd edits
+// place-holders for Ki and Kd edits
 float raw_Ki, raw_Kd;
 
-/* Main status screen. It's up to the implementation specific part to show what is needed. As this is very display dependend */
+/* Main status screen. It's up to the implementation specific part to show what is needed. As this is very display dependent */
 static void lcd_status_screen()
 {
     if (lcd_status_update_delay)
@@ -1055,7 +1055,7 @@ void lcd_update()
     {
         lcdDrawUpdate = 2;
         lcd_oldcardstatus = IS_SD_INSERTED;
-        lcd_implementation_init(); // to maybe revive the lcd if static electricty killed it.
+        lcd_implementation_init(); // to maybe revive the LCD if static electricity killed it.
 
         if(lcd_oldcardstatus)
         {
@@ -1470,7 +1470,7 @@ char *ftostr52(const float &x)
 }
 
 // Callback for after editing PID i value
-// grab the pid i value out of the temp variable; scale it; then update the PID driver
+// grab the PID i value out of the temp variable; scale it; then update the PID driver
 void copy_and_scalePID_i()
 {
 #ifdef PIDTEMP
@@ -1480,7 +1480,7 @@ void copy_and_scalePID_i()
 }
 
 // Callback for after editing PID d value
-// grab the pid d value out of the temp variable; scale it; then update the PID driver
+// grab the PID d value out of the temp variable; scale it; then update the PID driver
 void copy_and_scalePID_d()
 {
 #ifdef PIDTEMP

Marlin/ultralcd.h

@@ -17,7 +17,7 @@
   void lcd_setcontrast(uint8_t value);
 #endif
 
-  static unsigned char blink = 0;	// Variable for visualisation of fan rotation in GLCD
+  static unsigned char blink = 0;	// Variable for visualization of fan rotation in GLCD
 
   #define LCD_MESSAGEPGM(x) lcd_setstatuspgm(PSTR(x))
   #define LCD_ALERTMESSAGEPGM(x) lcd_setalertstatuspgm(PSTR(x))
@@ -72,7 +72,7 @@
   	  #define REPRAPWORLD_KEYPAD_MOVE_HOME (buttons_reprapworld_keypad&EN_REPRAPWORLD_KEYPAD_MIDDLE)
     #endif //REPRAPWORLD_KEYPAD
   #else
-    //atomatic, do not change
+    //atomic, do not change
     #define B_LE (1<<BL_LE)
     #define B_UP (1<<BL_UP)
     #define B_MI (1<<BL_MI)
@@ -85,7 +85,7 @@
     #define LCD_CLICKED ((buttons&B_MI)||(buttons&B_ST))
   #endif//NEWPANEL
 
-#else //no lcd
+#else //no LCD
   FORCE_INLINE void lcd_update() {}
   FORCE_INLINE void lcd_init() {}
   FORCE_INLINE void lcd_setstatus(const char* message) {}

Marlin/ultralcd_implementation_hitachi_HD44780.h

@@ -2,8 +2,8 @@
 #define ULTRA_LCD_IMPLEMENTATION_HITACHI_HD44780_H
 
 /**
-* Implementation of the LCD display routines for a hitachi HD44780 display. These are common LCD character displays.
-* When selecting the rusian language, a slightly different LCD implementation is used to handle UTF8 characters.
+* Implementation of the LCD display routines for a Hitachi HD44780 display. These are common LCD character displays.
+* When selecting the Russian language, a slightly different LCD implementation is used to handle UTF8 characters.
 **/
 
 #ifndef REPRAPWORLD_KEYPAD
@@ -20,7 +20,7 @@ extern volatile uint16_t buttons;  //an extended version of the last checked but
 // via a shift/i2c register.
 
 #ifdef ULTIPANEL
-// All Ultipanels might have an encoder - so this is always be mapped onto first two bits
+// All UltiPanels might have an encoder - so this is always be mapped onto first two bits
 #define BLEN_B 1
 #define BLEN_A 0