fix: Correctly format commas between product brands

[WildOrangutan]

What

Correctly format commas between product brands.

Screenshot

Fixes bug(s)

Fixes: #770

[codecov-commenter]

Codecov Report

Merging #3089 (417358b) into develop (de3b7bb) will decrease coverage by 0.00%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           develop   #3089      +/-   ##
==========================================
- Coverage     6.46%   6.46%   -0.01%     
==========================================
  Files          246     246              
  Lines        12197   12207      +10     
==========================================
  Hits           789     789              
- Misses       11408   11418      +10     

Impacted Files	Coverage Δ
...pp/lib/cards/product_cards/product_title_card.dart	0.00% <0.00%> (ø)
...cards/product_cards/smooth_product_card_found.dart	0.00% <0.00%> (ø)
...s/smooth_app/lib/helpers/product_cards_helper.dart	0.00% <0.00%> (ø)
..._app/lib/pages/product/add_basic_details_page.dart	0.00% <0.00%> (ø)

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[M123-dev]

I have very limited expierence with regular expressions, but this seems about right to me. Thanks for a lot for this fix @WildOrangutan

I'd say we merge here and if there are problems with bad data from translators we can always improve upon