Fixes #669: Log warning when ValidationError occurs during translation.

[Marvinrose]

Previously, when save_target() raised a ValidationError during translation, the error was silently suppressed. This caused a confusing DoesNotExist error to surface to the user instead of the real cause.

Changes

• operations.py: replaced contextlib.suppress(ValidationError) with a logger.warning() so the actual error is visible in logs.
• views/submit_translations.py: wrapped get_translation() with contextlib.suppress(DoesNotExist) so the view degrades gracefully when save_target() fails
• Added a test to verify the warning is logged

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.03%. Comparing base (4492663) to head (df6f33c).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #907      +/-   ##
==========================================
+ Coverage   93.02%   93.03%   +0.01%     
==========================================
  Files          47       47              
  Lines        4243     4251       +8     
  Branches      551      551              
==========================================
+ Hits         3947     3955       +8     
  Misses        177      177              
  Partials      119      119              

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