Work on improving failed oauth handling

[Crabcyborg]

Related issue https://github.com/Strategy11/formidable-stripe/issues/226

This needs improvement still.

• Don't use alert. Use a proper modal.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 29.27%. Comparing base (9b440df) to head (d19272f).
⚠️ Report is 9124 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #1344   +/-   ##
=========================================
  Coverage     29.27%   29.27%           
  Complexity     7253     7253           
=========================================
  Files           105      105           
  Lines         23918    23918           
=========================================
+ Hits           7002     7003    +1     
+ Misses        16916    16915    -1     

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