feat: 5201 - change currency with country when relevant

[monsieurtanuki]

What

We change the currency with the best possible matching value for a given country

• at onboarding time for new users, silently
• at app init time for old users that of course do not have a currency yet (recent field), silently
• when the user explicitly changes the country, via a "confirm?" dialog

Screenshot

Fixes bug(s)

• Closes: Try to prepopulate currency based on country for existing users #5201

Impacted files

• app_en.arb: message for a "change currency too?" dialog
• country_selector.dart: new method to change the currency at the same time as the country if relevant
• product_query.dart: init currency if null
• pubspec.lock: wtf
• pubspec.yaml: upgraded openfoodfacts to 3.8.0
• user_preferences_country_selector.dart: asking to change the currency at the same time as the country only if confirmed or relevant
• welcome_page.dart: explicitly asking to change the currency at the same time as the country

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 25 lines in your changes are missing coverage. Please review.

Project coverage is 8.62%. Comparing base (4d9c7fc) to head (83f4424).
Report is 111 commits behind head on develop.

Files	Patch %	Lines
...oth_app/lib/pages/onboarding/country_selector.dart	0.00%	22 Missing ⚠️
packages/smooth_app/lib/query/product_query.dart	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           develop   #5238      +/-   ##
==========================================
- Coverage     9.54%   8.62%   -0.93%     
==========================================
  Files          325     329       +4     
  Lines        16411   16709     +298     
==========================================
- Hits          1567    1441     -126     
- Misses       14844   15268     +424     

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[teolemon]

Can we split into 2 sentences/strings, and avoid ellisions (You've) ?
Can we avoid adding things to the onboarding until we have a compelling value proposition ? (And even so, I'd rather move to small mono-theme, in context onboardings)

[monsieurtanuki]

Can we split into 2 sentences/strings, and avoid ellisions (You've) ?

I can split into 2 sentences.
I'm not convinced by your idea of removing contractions - as explained here (https://m.youtube.com/watch?v=rNcS0S__WlQ), but as long as I split into 2 sentences you'll be able - I mean you will be able - to have it your way.

Can we avoid adding things to the onboarding until we have a compelling value proposition ? (And even so, I'd rather move to small mono-theme, in context onboardings)

I haven't really added anything to the onboarding. It's just that I doesn't seem relevant to display ADP (aka Andorran peseta) as the selected currency for any user that hasn't set the currency yet.
Or maybe I misinterpreted your comment.

[monsieurtanuki]

@teolemon Done.

[monsieurtanuki]

Thank you @teolemon for your review!