Regenerate cms.pot file

[lw]

I first reverted the {% -> {%+ change as that doesn't appear to be compatible with Babel's extracter, then ran ./setup.py extract_messages.

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This change is 

[codecov]

Codecov Report

Merging #1114 into master will decrease coverage by 0.05%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1114      +/-   ##
==========================================
- Coverage   61.99%   61.93%   -0.06%     
==========================================
  Files         230      230              
  Lines       16591    16591              
==========================================
- Hits        10285    10276       -9     
- Misses       6306     6315       +9

Flag	Coverage Δ
#functionaltests	45.76% <ø> (+0.14%)	⬆️
#unittests	43.26% <ø> (+0.02%)	⬆️

Impacted Files	Coverage Δ
cms/db/base.py	85.1% <0%> (-4.26%)	⬇️
cms/service/esoperations.py	77.3% <0%> (-3.55%)	⬇️
cms/grading/Job.py	85.78% <0%> (-3.32%)	⬇️
cms/io/PsycoGevent.py	65.71% <0%> (-2.86%)	⬇️
cms/server/admin/handlers/base.py	67.11% <0%> (-2.04%)	⬇️
cms/server/admin/handlers/task.py	39.84% <0%> (-1.18%)	⬇️
cms/db/util.py	51.11% <0%> (-0.75%)	⬇️
cms/server/admin/handlers/dataset.py	25.38% <0%> (-0.31%)	⬇️
cms/io/rpc.py	91.46% <0%> (ø)	⬆️
cms/service/ProxyService.py	57.97% <0%> (+0.53%)	⬆️
... and 7 more

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[lw]

Rebased and updated this.

[stefano-maggiolo]

LGTM