Port: Improve alignment exception error reporting

[pmachapman]

Fixes #283

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This change is 

[codecov-commenter]

Codecov Report

❌ Patch coverage is 57.89474% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 91.50%. Comparing base (b711bad) to head (ac4f647).

Files with missing lines	Patch %	Lines
machine/corpora/n_parallel_text_corpus.py	58.33%	5 Missing ⚠️
machine/corpora/standard_parallel_text_corpus.py	60.00%	2 Missing ⚠️
machine/corpora/corpora_utils.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #303      +/-   ##
==========================================
- Coverage   91.53%   91.50%   -0.03%     
==========================================
  Files         355      355              
  Lines       23028    23042      +14     
==========================================
+ Hits        21079    21085       +6     
- Misses       1949     1957       +8     

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