This PR adds spanish translation from arb file. This is a translation-only change.

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• [X] I read the Contributor Guide and followed the process outlined there for submitting PRs.
• If you made changes to the code:
  • [ ] I added new tests to check the change I am making or feature I am adding.
  • [ ] All existing and new tests are passing.

Hi, I searched with this pull request added French to the languages already managed by the application. I hope this is useful for you.

Pre-launch Checklist

• [X] I read the Contributor Guide and followed the process outlined there for submitting PRs.
• If you made changes to the code:
  • [X] All existing and new tests are passing.

This PR adds Slovak translation.

Pre-launch Checklist

• [x] I read the Contributor Guide and followed the process outlined there for submitting PRs.
• If you made changes to the code:
  • [ ] I added new tests to check the change I am making or feature I am adding.
  • [ ] All existing and new tests are passing.

Related to #1

Priority features:

• [x] Notifications (https://github.com/MaikuB/flutter_local_notifications/commit/d1cd8f2df2f7e711c03412cbd4007da354db5603)
• [x] Background working
  • [x] System tray icon
• [x] Getting device locale (https://github.com/magnatronus/flutter-devicelocale/commit/ba55b8621535d394f8c6fd81766363e7d20d022b)

Additional features:

• [ ] Receive sharing
• [ ] Barcode scanning

Replace this paragraph with a description of what this PR is changing or adding, and why. Consider including before/after screenshots.

Pre-launch Checklist

• [x] I read the Contributor Guide and followed the process outlined there for submitting PRs.
• If you made changes to the code:
  • [x] I added new tests to check the change I am making or feature I am adding.
  • [x] All existing and new tests are passing.

https://developer.fedex.com/api/en-us/catalog/track.html#/api

I'm not qualified to substantively review the API, but it looks appropriate to me.

It'd be great to have in the USA as USPS, UPS, FedEx, and DHL cover pretty much any and all "last-mile" post, with USPS being the main provider of last-mile service, even for other services.

They don't have official api for parcel tracking, but we can do something with html parsing. Usually AliExpress uses this provider for parcels that are going to Russia

Would be cool to have Correos support, it's the local spanish postal service.

Here's how the url works: https://www.correos.es/es/es/herramientas/localizador/envios/detalle?tracking-number="TRACKINGNUMBER"

And here's info about the API: https://www.correos.es/es/en/companies/e-commerce/reinforce-your-ecommerce-logistics/api-integration

Posten Norge (“Norway Post”) and Bring (operating name in other countries) use the same API:

https://tracking.bring.com/api/v2/tracking.<format>?q=<tracking-number>

Where <format> is json or xml, and <tracking-number> is the tracking number.

API documentation: https://developer.bring.com/api/tracking/

No keys are needed

I registered for the API and put in my username and company name to LibreTrack, but shouldn't it also need the password?

I am seeing no indication that is pulling any data from my account.

Приложение хорошее, но на нескольких девайсах, где оно пробовалось, наблюдаются странные баги: при тапе на любой элемент интерфейса (шапка меню, какая-нибудь кнопка, любой элемент внутри приложения вообще) нажатие происходит практически всегда не с первого раза, а со второго-третьего-четвёртого, будто проблемы у смартфона с тачем (что, конечно, не так) или что-то с областью DPI (как это верно называется - не в курсе).