pangram: make missing test's name clearer [Fix #314]

exercises/pangram/src/test/java/PangramsTest.java

 
     @Ignore
     @Test
-    public void upperAndLowerCaseVersionsOfTheSameCharacterShouldNotBeCountedSeparatelyIsNotPangram() {
+    public void upperAndLowerCaseVersionsOfTheSameCharacterShouldNotBeCountedSeparately() {
         assertFalse(Pangrams.isPangram("the quick brown fox jumped over the lazy FOX"));
     }
 }