Translate the problem types in a dropdown

[int-y1]

Go to /problems/. ru contains a translation for String Algorithms, so the dropdown looks like:

[codecov-commenter]

Codecov Report

Merging #1948 (3dd5d88) into master (966b37d) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1948   +/-   ##
=======================================
  Coverage   46.46%   46.46%           
=======================================
  Files         236      236           
  Lines       13114    13114           
=======================================
  Hits         6093     6093           
  Misses       7021     7021           

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[Ninjaclasher]

Would it make sense to add a similar change for problem categories?

[int-y1]

Problem categories are out of scope. In particular, they require these steps:

• Modify makedmojmessages to get all problem categories. Example:

  online-judge/judge/management/commands/makedmojmessages.py

  Lines 127 to 130 in 8eed5e5

  	for name in ProblemType.objects.values_list('full_name', flat=True):
  	if self.verbosity > 2:
  	self.stdout.write('processing problem type name "%s"\n' % name)
  	self._emit_message(potfile, name)

• Wait for Crowdin translators to translate those strings, and an admin to get those translations.
• Use user_trans in the appropriate templates.

[Ninjaclasher]

I see, this is out of scope.

[Xyene]

LGTM, thanks!