Possible Localization issues in msbuild errors/warnings

This is fresh from xcode 12 branch:

```
/Library/Frameworks/Mono.framework/External/xbuild/Xamarin/iOS/Xamarin.iOS.Common.targets(1729,3): warning : The App Extension 'NativeWidget' has a CFBundleVersion (1) that does not match the main app bundle's CFBundleVersion (1.0)
/Library/Frameworks/Mono.framework/External/xbuild/Xamarin/iOS/Xamarin.iOS.Common.targets(1729,3): warning :
/Library/Frameworks/Mono.framework/External/xbuild/Xamarin/iOS/Xamarin.iOS.Common.targets(1729,3): warning : "The App Extension '{0}' has a CFBundleVersion ({1}) that does not match the main app bundle's CFBundleVersion ({2})
/Library/Frameworks/Mono.framework/External/xbuild/Xamarin/iOS/Xamarin.iOS.Common.targets(1729,3): warning : "
/Library/Frameworks/Mono.framework/External/xbuild/Xamarin/iOS/Xamarin.iOS.Common.targets(1729,3): warning : System.FormatException: Index (zero based) must be greater than or equal to zero and less than the size of the argument list.
/Library/Frameworks/Mono.framework/External/xbuild/Xamarin/iOS/Xamarin.iOS.Common.targets(1729,3): warning : at System.Text.StringBuilder.AppendFormatHelper (System.IFormatProvider provider, System.String format, System.ParamsArray args) [0x003da] in /Users/builder/jenkins/workspace/build-package-osx-mono/2019-12/external/bockbuild/builds/mono-x64/external/corefx/src/Common/src/CoreLib/System/Text/StringBuilder.cs:1637
/Library/Frameworks/Mono.framework/External/xbuild/Xamarin/iOS/Xamarin.iOS.Common.targets(1729,3): warning : at System.String.FormatHelper (System.IFormatProvider provider, System.String format, System.ParamsArray args) [0x0000e] in /Users/builder/jenkins/workspace/build-package-osx-mono/2019-12/external/bockbuild/builds/mono-x64/external/corefx/src/Common/src/CoreLib/System/String.Manipulation.cs:471
/Library/Frameworks/Mono.framework/External/xbuild/Xamarin/iOS/Xamarin.iOS.Common.targets(1729,3): warning : at System.String.Format (System.IFormatProvider provider, System.String format, System.Object[] args) [0x00018] in /Users/builder/jenkins/workspace/build-package-osx-mono/2019-12/external/bockbuild/builds/mono-x64/external/corefx/src/Common/src/CoreLib/System/String.Manipulation.cs:463
/Library/Frameworks/Mono.framework/External/xbuild/Xamarin/iOS/Xamarin.iOS.Common.targets(1729,3): warning : at Microsoft.Build.Framework.LazyFormattedBuildEventArgs.FormatString (System.Globalization.CultureInfo culture, System.String unformatted, System.Object[] args) [0x00009] in /Users/builder/jenkins/workspace/build-package-osx-mono/2019-12/external/bockbuild/builds/msbuild-15/src/Framework/LazyFormattedBuildEventArgs.cs:258
/Library/Frameworks/Mono.framework/External/xbuild/Xamarin/iOS/Xamarin.iOS.Common.targets(2073,3): error MSB6006: "codesign" exited with code 1.
```
```
Log.LogWarning (MSBStrings.W0071, name, shortVersionString, mainShortVersionString);
The App Extension ‘{0}’ has a CFBundleShortVersionString ({1}) that does not match the main app bundle’s CFBundleShortVersionString ({2})
```

Someone should trigger some msbuild warnings and see if they all do this...