Expire translations after zanata push

After merging PRs and pushing their string changes, pull the
translations.  This picks up translation invalidations (English text
has changed), helping to make sure the translations are not wrong.

PRs to consider:
  - oVirt#1533
  - oVirt#1537
  - oVirt#1539
  - oVirt#1540
  - oVirt#1543
  - oVirt#1549
  - oVirt#1564
  - oVirt#1584
  - oVirt#1585 ** pending merge
  - oVirt#1592 ** pending merge