feat: 3863 - multilingual input for product name

[monsieurtanuki]

Impacted files:

• language_selector.dart: moved code to new static method openLanguageSelector
• user_preferences_languages_list.dart: minor refactoring
• user_preferences_settings.dart: minor refactoring

What

• Preliminary work regarding multilingual features: we needed a reusable language selector method.

Part of

• Make it possible to view the product name in several languages #3863

[codecov-commenter]

Codecov Report

Merging #3890 (a437ba7) into develop (26b456e) will decrease coverage by 0.04%.
The diff coverage is 0.66%.

@@             Coverage Diff             @@
##           develop    #3890      +/-   ##
===========================================
- Coverage    10.59%   10.55%   -0.04%     
===========================================
  Files          270      270              
  Lines        13366    13424      +58     
===========================================
+ Hits          1416     1417       +1     
- Misses       11950    12007      +57     

Impacted Files	Coverage Δ
...smooth_app/lib/data_models/up_to_date_changes.dart	0.00% <0.00%> (ø)
...app/lib/generic_lib/widgets/language_selector.dart	0.00% <0.00%> (ø)
...b/pages/preferences/user_preferences_settings.dart	6.57% <0.00%> (-0.07%)	⬇️
..._app/lib/pages/product/add_basic_details_page.dart	0.00% <0.00%> (ø)
packages/smooth_app/lib/query/product_query.dart	8.10% <ø> (ø)
...s/preferences/user_preferences_languages_list.dart	5.88% <6.66%> (+5.88%)	⬆️

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[monsieurtanuki]

@teolemon The UX is very smooth for multilingual product names.

Used to be:

Now is

French translation	language selector	Dutch translation

There's still a bit confusion on "how to get rid of a translation": sometimes if you put an empty String it removes the translation for that language, sometimes it sets it to ...erm... an empty String.

Some multilingual products to play with:

• 8027498025058
• 3760091722508
• 7300400481588

[monsieurtanuki]

Thank you @teolemon for your approval!
Now we have a basis for multilingual inputs.

[teolemon]

@monsieurtanuki testing in the internal, I realize that products with one language don't have the option to add more languages

[monsieurtanuki]

@monsieurtanuki testing in the internal, I realize that products with one language don't have the option to add more languages

@teolemon What you mean is that "old" products don't have the option to add more languages.
Refreshed products with one language do have the option to add languages.
Functionally, technically and visually, I'm not sure how to handle both monolingual and multilingual cases on the same page.
Little by little, the products will get refreshed and therefore will get the extra multilingual field. Which will solve the issue, eventually.