Localizations | macOS app that manages localizations | Internationalization library

I have a problem with my app...I can not get the correct current Locale of my app.

This:

I want to localize notification , and i find that there is properties for that , like title_loc_key, body_loc_key

he FCM fields used for localizing (I18N) the notification title and body are not working. For example:

For my debut with Dart/Flutter I created a very simple demo app with a localized text within a Drawer. The app compiles and starts in the Android Emulator, but only to abort shortly after with the error message Null check operator used on a null value. Outside of the Drawer, the localization works flawlessly.

What exactly did I do wrong and how to fix it?

Versions:

When I try to run the application on android with "flutter run" in terminal, I am getting the following error...

I am still looking for a better way to localize a percentage value in Dart/Flutter. So far, I'm just converting a percentage value to a suitable string with the following code: '${(_percentage * 100).toStringAsFixed(3)}%'

For a percentage value of e.g. 65.7893 you get the following string: 65.789%. That's fine for English, but not for other languages.

For example, for German, the string should be as follows: 65,789 %

Thanks to the useful tips, I have now created the following wrapper function.

I have an iOS app where I'm trying to show the current selected language, but also include its variation, i.e. "English (Canada), English (US), ...", as seen in the attached image.

I am already using the preferred language from Bundle, like so:

I have a Swift Package that has multiple translations in folders inside a "Resources" folder, e.g. "Resources/de.lproj/Localizable.strings" and "Resources/en.lproj/Localizable.strings".

Since I updated to Xcode 12.5, the App implementing this Swift Package does always fallback to English, it only returns Strings localized in English. My Package.swift has "de" as default:

defaultLocalization: "de",

Example: Running the app on a device set to German:

I am experiencing a peculiar error after migrating my Asp.Net Core MVC Webapp solution from .Net Core 2.2 to .Net Core 3.1.
I followed the steps described in the official docs, updating Program, Startup, nuget packages ...

I am using Syncfusion Essential Studio 2 - which I believe is not related to this error - and in a number of views I am declaring variables/creating objects, like creating a DropDownList which I use for a lookup in a Datagrid:

I am following a tutorial trying to create a horizontal SingleChildScrollView which contains object with product description and a currency + price tag with two decimals. Implementing NumberFormat.currency method returns an error: NoSuchMethodError class 'String' has no instance getter 'isNegative'

Can someone help to understand why it is not pulling "price" value please? If I hard code it and assign a value to the final double price = ie: 29.90; in AngeboteCard() class it does but not from the Angebote() class.

This is my class: