localization: Move from orangecanvas.utils to orangecanvas

[janezd]

Presumably fixes biolab/orange3#6952: localization used to be inside orangecanvas.utils, and orange.canvas.utils.__init__ required Qt.

This PR moves localization to the root to avoid depending on Qt. Old imports are deprecated, but work.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 71.18644% with 34 lines in your changes missing coverage. Please review.

Project coverage is 76.57%. Comparing base (86724ab) to head (f1f9e82).

Files with missing lines	Patch %	Lines
orangecanvas/localization/__init__.py	56.57%	33 Missing ⚠️
orangecanvas/localization/si.py	97.14%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #320      +/-   ##
==========================================
- Coverage   76.57%   76.57%   -0.01%     
==========================================
  Files         100      102       +2     
  Lines       21240    21255      +15     
==========================================
+ Hits        16265    16275      +10     
- Misses       4975     4980       +5     

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