feat: Add localized fields for conservation conditions and customer service in Product object

[AffanShaikhsurab]

What

• Added 'conservation_conditions_languages' and 'customer_service_languages' fields to the Product object for better multilingual support.
• Updated the logic to handle localization using language-based keys, similar to product name fields.

Screenshot

Fixes bug(s)

• Add new localized ProductField's #960 (Add new localized ProductField's)

Part of

• Add new localized ProductField's #960 (Add new localized ProductField's)

[monsieurtanuki]

Hi @AffanShaikhsurab!
I didn't get that: even product.g.dart wasn't generated? Without it we cannot do anything.
Besides, reviewing your code, I saw that we don't need 3 product fields for each of those minor labels: the "all languages" is more than enough.

[AffanShaikhsurab]

soory for that . i have removed all the unwanted fields . But still when i try to rebuild its still casusing the same error :
am i doing something wrong ?

PS C:\Users\affan\Affan Projects\open source\open\openfoodfacts-dart> dart run build_runner build
[INFO] Generating build script completed, took 207ms
[WARNING] Invalidated precompiled build script due to missing asset graph.
[INFO] Precompiling build script... completed, took 803ms
[INFO] Building new asset graph completed, took 578ms
[INFO] Found 59 declared outputs which already exist on disk. This is likely because the.dart_tool/build folder was deleted, or you are submitting generated files to your source repository.
Delete these files?
1 - Delete
2 - Cancel build
3 - List conflicts