TranslateClauseWithTerminator: Look out for filling num_wtab (#2093)

src/libespeak-ng/translate.c

 		char *pn;
 		char *pw;
 		char number_buf[150];
-		WORD_TAB num_wtab[50]; // copy of 'words', when splitting numbers into parts
+		WORD_TAB num_wtab[N_CLAUSE_WORDS]; // copy of 'words', when splitting numbers into parts
 
 		// start speaking at a specified word position in the text?
 		count_words++;
 			if ((n_digits > tr->langopts.max_digits) || (word[0] == '0'))
 				words[ix].flags |= FLAG_INDIVIDUAL_DIGITS;
 
-			while (pn < &number_buf[sizeof(number_buf)-20]) {
+			while (pn < &number_buf[sizeof(number_buf)-20] && nw < N_CLAUSE_WORDS-1) {
 				if (!IsDigit09(c = *pw++) && (c != tr->langopts.decimal_sep))
 					break;
 
 			pn[16] = 0;
 			nw = 0;
 
-			for (pw = &number_buf[3]; pw < pn;) {
+			for (pw = &number_buf[3]; pw < pn && nw < N_CLAUSE_WORDS;) {
 				// keep wflags for each part, for FLAG_HYPHEN_AFTER
 				dict_flags = TranslateWord2(tr, pw, &num_wtab[nw++], words[ix].pre_pause);
 				while (*pw && *pw++ != ' ')