get_wordlist using global variable to reduce reading from disk

MariaVrequested to merge
move_word_list into master

  1. moved get_wordlist outside of CreateIdentifierView to general function in views.py, returning a global variable to minimize reading from disk

  2. refactored CreateIdentifierView and validate_user_identifier functions to depend on new get_wordlist function.

  3. refactored appropriate tests; all tests again pass.

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