Fix up USFM pretranslations for Parallel corpus

[johnml1135]

#522

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This change is 

[Enkidu93]

Reviewable status: 0 of 3 files reviewed, 1 unresolved discussion (waiting on @ddaspit and @johnml1135)

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src/Serval/src/Serval.Translation/Services/PretranslationService.cs line 55 at r1 (raw file):

        else if (parallelCorpus is not null)
        {
            sourceFile = parallelCorpus.SourceCorpora[0].Files[0];

What about a situation in which we're using a parallel corpus that has two source (or target) corpora: one that includes MAT & MRK and another that includes MRK & JHN. Won't be run into issues if we try and insert pretranslations into the USFM for JHN from a project that isn't the one that contains JHN?

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 88.09524% with 5 lines in your changes missing coverage. Please review.

Project coverage is 56.98%. Comparing base (6e9b736) to head (fa6a04d).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...rval.Translation/Services/PretranslationService.cs	76.92%	2 Missing and 1 partial ⚠️
...rval.Machine.Shared/Services/PreprocessBuildJob.cs	83.33%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #529      +/-   ##
==========================================
+ Coverage   56.91%   56.98%   +0.06%     
==========================================
  Files         299      299              
  Lines       15706    15738      +32     
  Branches     2168     2174       +6     
==========================================
+ Hits         8939     8968      +29     
- Misses       6119     6120       +1     
- Partials      648      650       +2     

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[johnml1135]

src/Serval/src/Serval.Translation/Services/PretranslationService.cs line 55 at r1 (raw file):

Previously, Enkidu93 (Eli C. Lowry) wrote…

What about a situation in which we're using a parallel corpus that has two source (or target) corpora: one that includes MAT & MRK and another that includes MRK & JHN. Won't be run into issues if we try and insert pretranslations into the USFM for JHN from a project that isn't the one that contains JHN?

Resolved through the meetings we had.

[johnml1135]

Reviewed 3 of 3 files at r1, 4 of 4 files at r2, 1 of 1 files at r3, all commit messages.
Reviewable status: all files reviewed, 1 unresolved discussion (waiting on @ddaspit and @Enkidu93)