Prevent TranslateRoman reading stack data from Lookup.

src/libespeak-ng/dictionary.c

 	if (flags[0] & FLAG_TEXTMODE) {
 		say_as = option_sayas;
 		option_sayas = 0; // don't speak replacement word as letter names
-		strncpy0(text, word1, sizeof(text));
-		flags0 = TranslateWord(tr, text, NULL, NULL);
+		// NOTE: TranslateRoman checks text[-2], so pad the start of text to prevent
+		// it reading data on the stack.
+		text[0] = ' ';
+		text[1] = ' ';
+		strncpy0(text+2, word1, sizeof(text)-2);
+		flags0 = TranslateWord(tr, text+2, NULL, NULL);
 		strcpy(ph_out, word_phonemes);
 		option_sayas = say_as;
 	}