MNT: Replace deprecated locale.getdefaultlocale

[effigies]

Closes #3563.

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (ef13221) 63.17% compared to head (fcb0e48) 63.17%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3590   +/-   ##
=======================================
  Coverage   63.17%   63.17%           
=======================================
  Files         308      308           
  Lines       40813    40813           
  Branches     5654     5654           
=======================================
  Hits        25784    25784           
  Misses      14016    14016           
  Partials     1013     1013           

Impacted Files	Coverage Δ
nipype/utils/filemanip.py	72.18% <100.00%> (ø)
nipype/utils/subprocess.py	86.66% <100.00%> (ø)

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