Fix syntax highlighting for short type (#1260)

* fix: add syntax coloring for short and Short types

* don't use unsupported Short datatype

Author: aj-m

java/keywords.txt

@@ -251,6 +251,7 @@ double	KEYWORD5	double
 float	KEYWORD5	float
 int	KEYWORD5	int
 long	KEYWORD5	long
+short	KEYWORD5	short
 var	KEYWORD5