Show ALT as OPTION in keyboard shortcut list

data/language/english_uk.txt

@@ -3972,6 +3972,7 @@ STR_5630    :Enable unlocking of scenarios
 STR_5631    :Original DLC Parks
 STR_5632    :Build your own...
 STR_5633    :CMD + 
+STR_5634    :OPTION + 
 
 #############
 # Scenarios #

src/interface/keyboard_shortcut.c

@@ -97,7 +97,11 @@ void keyboard_shortcut_format_string(char *buffer, uint16 shortcutKey)
 		strcat(buffer, formatBuffer);
 	}
 	if (shortcutKey & 0x400) {
+#if defined(__APPLE__) && defined(__MACH__)
+		format_string(formatBuffer, STR_OPTION_PLUS, NULL);
+#else
 		format_string(formatBuffer, STR_ALT_PLUS, NULL);
+#endif
 		strcat(buffer, formatBuffer);
 	}
 	if (shortcutKey & 0x800) {

src/localisation/string_ids.h

@@ -2258,6 +2258,7 @@ enum {
 	STR_BUILD_YOUR_OWN_PARKS = 5632,
 	
 	STR_CMD_PLUS = 5633,
+	STR_OPTION_PLUS = 5634,
 
 	// Have to include resource strings (from scenarios and objects) for the time being now that language is partially working
 	STR_COUNT = 32768