fix: 3042 - saving explicitly product name in the correct language

[monsieurtanuki]

What

• Now the lang field of product is set explicitly for each server update.
• As a result, when we set productName, we set it just for that language. The other translations are not impacted.
• That should also impact ingredients, but I haven't double-checked yet.

Fixes bug(s)

• Fixes: On a French device, with French and France as settings, product_name is saved as product_name_en #3042

[codecov-commenter]

Codecov Report

Merging #3862 (185489c) into develop (8187e40) will decrease coverage by 0.01%.
The diff coverage is 0.00%.

@@             Coverage Diff             @@
##           develop    #3862      +/-   ##
===========================================
- Coverage    10.73%   10.73%   -0.01%     
===========================================
  Files          273      273              
  Lines        13478    13479       +1     
===========================================
  Hits          1447     1447              
- Misses       12031    12032       +1     

Impacted Files	Coverage Δ
...th_app/lib/background/background_task_details.dart	0.00% <0.00%> (ø)

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[teolemon]

It should also impact packaging text.

[monsieurtanuki]

It should also impact packaging text.

Probably. Something like "whatever text I'm writing is in this language" (at the product level), in addition to the language and country we already define (at the query level).

[monsieurtanuki]

But I'm not sure we use packaging text that much any more. We rather use the "new" packaging items, don't we?

[teolemon]

Yes @monsieurtanuki . We however have to ensure image upload selection/deselect/crop is present in the new system (which it isn't)

[M123-dev]

Codewise it looks good to me, though I don't know which side effects could happen when having a just partly multilingual app

[monsieurtanuki]

Codewise it looks good to me, though I don't know which side effects could happen when having a just partly multilingual app

Thank you @M123-dev for your review!
I don't know either if there will be side-effects, but it sounds fair to explicitly set the language anyway.
Here it's about monolingual texts; there will soon be changes regarding multilingual texts.