Update fontKey calculation

Make fontKey independent from culture.

DEVSIX-717

Author: pavel-alay

io/src/main/java/com/itextpdf/io/font/FontProgramFactory.java

@@ -46,7 +46,6 @@ This file is part of the iText (R) project.
 import com.itextpdf.io.IOException;
 import com.itextpdf.io.util.ArrayUtil;
 
-import java.text.MessageFormat;
 import java.util.Set;
 
 /**
@@ -277,7 +276,7 @@ public static FontProgram createFont(String name, byte[] font, boolean cached) t
             if (name != null) {
                 fontKey = name;
             } else {
-                fontKey = MessageFormat.format("{0}", ArrayUtil.hashCode(font));
+                fontKey = Integer.toString(ArrayUtil.hashCode(font));
             }
             fontFound = FontCache.getFont(fontKey);
             if (fontFound != null) {
@@ -378,7 +377,7 @@ public static FontProgram createType1Font(String name, byte[] afm, byte[] pfb, b
             if (name != null) {
                 fontKey = name;
             } else {
-                fontKey = MessageFormat.format("{0}", ArrayUtil.hashCode(afm));
+                fontKey = Integer.toString(ArrayUtil.hashCode(afm));
             }
             fontProgram = FontCache.getFont(fontKey);
             if (fontProgram != null) {
@@ -463,7 +462,7 @@ public static FontProgram createFont(String ttc, int ttcIndex, boolean cached) t
     public static FontProgram createFont(byte[] ttc, int ttcIndex, boolean cached) throws java.io.IOException {
         String fontKey = null;
         if (cached) {
-            fontKey = MessageFormat.format("{0}{1}", ArrayUtil.hashCode(ttc), ttcIndex);
+            fontKey = Integer.toString(ArrayUtil.hashCode(ttc)) + Integer.toString(ttcIndex);
             FontProgram fontFound = FontCache.getFont(fontKey);
             if (fontFound != null) {
                 return fontFound;