refacto: how path to static files (images and locales) are resolved in Python and frozen mode (pyinstaller)

[Guts]

This pr fixes this error:

[codecov]

Codecov Report

Attention: Patch coverage is 45.16129% with 17 lines in your changes are missing coverage. Please review.

Project coverage is 20.71%. Comparing base (0d2930b) to head (07668e5).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #225      +/-   ##
==========================================
+ Coverage   20.41%   20.71%   +0.29%     
==========================================
  Files          37       37              
  Lines        3017     3032      +15     
  Branches      308      310       +2     
==========================================
+ Hits          616      628      +12     
- Misses       2371     2372       +1     
- Partials       30       32       +2     

Flag	Coverage Δ
unittests	20.71% <45.16%> (+0.29%)	⬆️

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Files	Coverage Δ
dicogis/__about__.py	100.00% <100.00%> (ø)
dicogis/constants.py	93.54% <ø> (ø)
dicogis/cli/cmd_list.py	0.00% <0.00%> (ø)
dicogis/georeaders/process_files.py	0.00% <0.00%> (ø)
dicogis/utils/notifier.py	0.00% <0.00%> (ø)
dicogis/utils/texts.py	80.00% <71.42%> (-3.34%)	⬇️
dicogis/utils/utils.py	40.00% <66.66%> (+6.15%)	⬆️
dicogis/DicoGIS.py	0.00% <0.00%> (ø)