🎨 Updated string macros

Marlin/src/core/multi_language.h

@@ -78,7 +78,7 @@ typedef const char Language_Str[];
   #define GET_TEXT(MSG) GET_LANG(LCD_LANGUAGE)::MSG
   #define MAX_LANG_CHARSIZE LANG_CHARSIZE
 #endif
-#define GET_TEXT_F(MSG) (const __FlashStringHelper*)GET_TEXT(MSG)
+#define GET_TEXT_F(MSG) FPSTR(GET_TEXT(MSG))
 
 #define GET_LANGUAGE_NAME(INDEX) GET_LANG(LCD_LANGUAGE_##INDEX)::LANGUAGE
 #define LANG_CHARSIZE GET_TEXT(CHARSIZE)

Marlin/src/core/types.h

@@ -27,7 +27,11 @@
 #include "../inc/MarlinConfigPre.h"
 
 class __FlashStringHelper;
-typedef const __FlashStringHelper *progmem_str;
+typedef const __FlashStringHelper* FSTR_P;
+#ifndef FPSTR
+  #define FPSTR(S) (reinterpret_cast<FSTR_P>(S))
+#endif
+#define FTOP(S) (reinterpret_cast<const char*>(S))
 
 //
 // Conditional type assignment magic. For example...