added list of verb tenses and changed spellings in rest of file to match
that list
removed construct_tense_menu from here and moved it to VerbTrainer as
the French and spanish versions were identical expected for which tense
list was being used
changed construct_tense_menu tests to reflect that the function was now
part of VerbTrainer
spelling changes to parallel French tenses list
Refactoring to remove duplicate menu code in Spanish and French sections