fix: Update transifex pull command.

[dianakhuang]

The Transifex cli started requiring the -t or --translations flag in the pull command in order to fetch translations.

edx/edx-arch-experiments#77

[codecov]

Codecov Report

Base: 90.31% // Head: 90.31% // No change to project coverage 👍

Coverage data is based on head (5c0f0cf) compared to base (2438683).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #119   +/-   ##
=======================================
  Coverage   90.31%   90.31%           
=======================================
  Files           9        9           
  Lines         351      351           
  Branches       31       31           
=======================================
  Hits          317      317           
  Misses         33       33           
  Partials        1        1           

Impacted Files	Coverage Δ
tests/test_transifex.py	100.00% <ø> (ø)

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