fix: tweaks to dev mode

[teolemon]

What

• fix: tweaks to dev mode
  This is the occassion to say that it would be good at some point:
• To make all those strings translatable
• To graduate preferences & help search to a real feature
• To do Import/Export of Lists #3830 and remove the copy paste history export

[teolemon]

Running 'flutter pub upgrade' in /home/runner/work/smooth-app/smooth-app/packages/smooth_app
[app_en.arb:dev_preferences_test_environment_subtitle] ICU Syntax Error: Expected "identifier" but found "0".
Current Test Environment: {0}
^
[app_en.arb:dev_preferences_news_provider_status_subtitle] ICU Syntax Error: Expected "identifier" but found "0".
Last update: {0}
^
[app_hu.arb:plural_ago_days] ICU Syntax Warning: The plural part specified below is overridden by a later plural part.
{count,plural, one {}=1{egy napja} other{{count} napja}}
^
[app_hu.arb:product_list_reloading_in_progress_multiple] ICU Syntax Warning: The plural part specified below is overridden by a later plural part.
{count,plural, one {}=0{Termék} =1{Termék} other{Termékek}} frissítése az előzményekben
^
[app_nl.arb:multiselect_title] ICU Syntax Warning: The plural part specified below is overridden by a later plural part.
{count,plural, one {}=0{Geen geselecteerd product} =1{Eén geselecteerd product} other{{count} geselecteerde producten}}
^
[app_nl.arb:product_list_reloading_success_multiple] ICU Syntax Warning: The plural part specified below is overridden by a later plural part.
{count,plural, one {}=0{Product} =1{Product} other{Producten}} vernieuwen voltooid
^
[app_nl.arb:prices_add_n_prices] ICU Syntax Warning: The plural part specified below is overridden by a later plural part.
{count,plural, one {}=1{Voeg een prijs toe} other{Voeg {count} prijzen toe}}
^
[app_nl.arb:prices_send_n_prices] ICU Syntax Warning: The plural part specified below is overridden by a later plural part.
{count,plural, one {}=1{Verstuur 1 prijs} other{Verstuur {count} prijzen}}
^
[app_pt.arb:prices_list_length_one_page] ICU Syntax Warning: The plural part specified below is overridden by a later plural part.
{count,plural, one {}=0{Ainda sem preço} =1{Apenas um preço} other{Todos os {count} preços}}
^
[app_uk.arb:prices_send_n_prices] ICU Syntax Warning: The plural part specified below is overridden by a later plural part.
{count,plural, one {Надіслати{count} ціну} few {Надіслати {count} ціни} many {Надіслати {count} цін}=1{Надіслати ціну} other{Надіслати {count} ціни}}
^