Fixing test cases.

src/main/java/org/meeuw/i18n/languages/DisplayNames.java

@@ -1,7 +1,5 @@
 package org.meeuw.i18n.languages;
 
-import java.util.stream.Stream;
-
 /**
  * All {@link ISO_639_Code#refName()} as a {@link java.util.ResourceBundle}.
  * The default tab-files of ISO-636 provide the names of all language in english.
@@ -11,9 +9,7 @@
 public class DisplayNames extends java.util.ListResourceBundle {
     @Override
     protected Object[][] getContents() {
-        return Stream.concat(
-            Stream.of(ISO_639_1_Code.values()),
-            ISO_639_3_Code.stream())
+        return LanguageCode.stream()
             .map(i -> new Object[] {i.code(), i.refName()})
             .toArray(i -> new Object[i][2]);
 

src/main/java/org/meeuw/i18n/languages/DisplayNames_en.java

@@ -0,0 +1,11 @@
+package org.meeuw.i18n.languages;
+
+/**
+ * All {@link ISO_639_Code#refName()} as a {@link java.util.ResourceBundle}.
+ * The default tab-files of ISO-636 provide the names of all language in english.
+ * This is the fallback for if a {@link java.util.PropertyResourceBundle} for given {@link java.util.Locale} is missing.
+ * @since 3.5
+ */
+public class DisplayNames_en extends DisplayNames {
+
+}