Multilingual configuration and improvements

[janezd]

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 30.43478% with 16 lines in your changes missing coverage. Please review.

Project coverage is 76.61%. Comparing base (2381b17) to head (2e91fef). Report is 60 commits behind head on master.

Files with missing lines	Patch %	Lines
orangecanvas/utils/localization/__init__.py	31.81%	15 Missing :warning:
orangecanvas/application/settings.py	0.00%	1 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #300      +/-   ##
==========================================
- Coverage   76.62%   76.61%   -0.01%     
==========================================
  Files          99      100       +1     
  Lines       21155    21207      +52     
==========================================
+ Hits        16209    16248      +39     
- Misses       4946     4959      +13     

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