Fix minor issues with authentication flow

[dermotduffy]

Fix two issues (both my fault):

• In my reconfigure PR I referred to the wrong step, breaking translations.
• In @loispostula 's auth PR, I suggested using None instead of empty strings -- turns out the frontend cannot serialize vol.Any(str, None), so this PR retreats to the use of empty strings which the frontend can serialize.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (2800089) to head (8affacb).
Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #807   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files           17        17           
  Lines         2140      2140           
=========================================
  Hits          2140      2140           

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