feat: Use Plus Jakarta Sans as the default font

[g123k]

Hi everyone,

In the design, Plus Jarkarta Sans is the font used by default.
This PR switches all the app to it.

[codecov-commenter]

Codecov Report

Merging #4361 (da44116) into develop (899cea6) will decrease coverage by 0.08%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           develop    #4361      +/-   ##
===========================================
- Coverage    10.45%   10.37%   -0.08%     
===========================================
  Files          291      293       +2     
  Lines        14416    14641     +225     
===========================================
+ Hits          1507     1519      +12     
- Misses       12909    13122     +213     

Impacted Files	Coverage Δ
packages/smooth_app/lib/main.dart	13.11% <ø> (ø)
packages/smooth_app/lib/themes/smooth_theme.dart	77.31% <100.00%> (+1.23%)	⬆️

... and 14 files with indirect coverage changes

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[github-actions]

You can test this PR on: https://app.waldo.com/applications/app-19d476740ba1bb36/sessions

[teolemon]

We reverted in the past because it doesn't work for all locales

[g123k]

Here is a list of unsupported langagues:

 // Adyghe, Avaric,Azerbaijani (Cyrillic),Bosnian (Cyrillic),Bulgarian
    //Chechen,Chuvash,Dargwa,Erzya,Evenki,Gagauz, Cyrillic,Interlingua,
    // Kabardian,Karachay-Balkar,Khakas, Komi, Komi-Permyak, Kumyk, Kurdish
    //Lak,Lezghian,Macedonian,Mari,Modern Greek,Moksha,Mongolian,Nanai,Nenets,
    // Ossetic,Romanian, Cyrillic,Russian,Russian Buriat,Rusyn,Sakha,Shor,
    // Southern Altai,Udmurt,Ukrainian,Western Mari

We should tell to revert to Roboto for them

[monsieurtanuki]

Here is a list of unsupported languages:

@g123k Keep in mind the maintainability. If reaaaaally you don't like the default font, please find a different font that works for all languages. If not, I would suggest you to close this PR.

[g123k]

Here is a list of unsupported languages:

@g123k Keep in mind the maintainability. If reaaaaally you don't like the default font, please find a different font that works for all languages. If not, I would suggest you to close this PR.

Actually, even Roboto doesn't support all languages.
Jakarta supports languages that Roboto doesn't and vice-versa.

[teolemon]

• Roboto: ✅ Good European Support, 🔴 Generic
• Plus Jakarta Sans: 🔴 Poor European Support, ✅ Matches our brand identity
• Risk: showing a Russian/Greek products in the French app. We'd need to make a potentially complex exception.
  https://fonts.google.com/specimen/Roboto/glyphs?query=roboto
  https://fonts.google.com/specimen/Plus+Jakarta+Sans/glyphs?query=plus+jakarta+sans
  
• It seems that we ended up using Public Sans on the web: https://fonts.google.com/specimen/Public+Sans: https://github.com/openfoodfacts/openfoodfacts-server/blob/8034910890ecd9c54cc39a360791ace6cbbf83e6/scss/_off.scss#L6

[monsieurtanuki]

off-dart currently supports 185 languages.
Both Roboto and Djakarta support more languages, and Public Sans supports less languages than Roboto.
To have a clear idea we need to check languages one by one, in order to filter to languages we do need.

[g123k]

I close this PR, as a real plan B is to use a real universal font.
Even if we use Roboto, it doesn't implement all the languages we need