Prevent Translation Object Duplicates

[ACK1D]

Prevent the creation of duplicate Translation objects with the same source and target locale. Replaced the explicit check for existing translations with the use of the get_or_create method, ensuring atomicity and avoiding potential duplicates. Fix #749

[codecov-commenter]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (92c18ab) 92.63% compared to head (ae05873) 92.58%.

Files	Patch %	Lines
wagtail_localize/operations.py	0.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #756      +/-   ##
==========================================
- Coverage   92.63%   92.58%   -0.05%     
==========================================
  Files          47       47              
  Lines        4057     4059       +2     
  Branches      601      602       +1     
==========================================
  Hits         3758     3758              
- Misses        176      177       +1     
- Partials      123      124       +1     

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[zerolab]

This is a good start @ACK1D. Thank you for correcting the typos too.

Could you please add some tests? I'd add a new test_operations.py test file under https://github.com/wagtail/wagtail-localize/tree/main/wagtail_localize/tests, add a secondary locale (example) and a page, then add a test that instantiates
TranslationCreator with the default and new locales for target_locales and calls create_translations() to check that only one translation has been created

[ACK1D]

@zerolab thanks a bunch for the detailed info. Can you check this out?

[zerolab]

One non-blocking note, but this is great work, thank you!

[zerolab]

Merged in 8b32d63. Thanks @ACK1D