Add missing tests to Pangram.
Add missing tests to Pangram.

- ensure titles of tests match those in
  https://github.com/exercism/x-common/blob/master/exercises/pangram/canonical-data.json

jmluy/xjava,jtigger/xjava,FridaTveit/xjava,exercism/xjava,exercism/xjava,FridaTveit/xjava,jmluy/xjava,nickRm/xjava,jtigger/xjava,nickRm/xjava