Will combine sentences into paragraphs when exporting txt

[raivisdejus]

Fix for #554

[codecov]

Codecov Report

Attention: Patch coverage is 87.50000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 82.47%. Comparing base (717f855) to head (7ef4075).
Report is 1 commits behind head on main.

Files	Patch %	Lines
buzz/transcriber/file_transcriber.py	87.50%	1 Missing ⚠️
...ranscription_viewer/transcription_viewer_widget.py	87.50%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #889   +/-   ##
=======================================
  Coverage   82.46%   82.47%           
=======================================
  Files          85       85           
  Lines        4666     4678   +12     
=======================================
+ Hits         3848     3858   +10     
- Misses        818      820    +2     

Flag	Coverage Δ
Linux	82.12% <87.50%> (+<0.01%)	⬆️
macOS	82.34% <87.50%> (+<0.01%)	⬆️

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