Fix the localization manager resolution

[hishamco]

Addresses #1094

[hishamco]

@sbwalker please merge this ASAP, it's a blocker

[isolution1]

The new error is still related to localization
InvalidOperationException: Sequence contains no elements
System.Linq.ThrowHelper.ThrowNoElementsException()
System.Linq.Enumerable.First(IEnumerable source)
Oqtane.Pages.HostModel.OnGet() in _Host.cshtml.cs
+
var defaultLanguage = languages.Where(l => l.IsDefault).SingleOrDefault() ?? languages.First();

[sbwalker]

These issues all seem to be related to the refactoring in #1071. @hishamco I would suggest you clear the connection string in your local installation and do a clean install to test your changes.

[hishamco]

Hope to do a final test on a clean installation

[sbwalker]

I just fixed the issue in #1096