Fixes U4-2640 LocalizationService throws exception when getting dictionary items and adds tests for the LocalizationService
Fixes: U4-5121 umbraco.content launches threadpool threads to reload the xml cache which causes lots of other issues

Conflicts:
	src/Umbraco.Web/umbraco.presentation/content.cs
Merge branch '6.2.1' into 6.2.2
Updates version
Removes Examine.dll deploy from nuspec
bumps nuspec versions
Merge remote-tracking branch 'origin/6.2.2' into 7.1.5

Conflicts:
	build/Build.bat
	build/NuSpecs/UmbracoCms.Core.nuspec
	build/NuSpecs/UmbracoCms.nuspec
	src/Umbraco.Core/Configuration/UmbracoVersion.cs
	src/Umbraco.Core/Services/PackagingService.cs
	src/Umbraco.Tests/Services/LocalizationServiceTests.cs
	src/Umbraco.Web.UI/Umbraco.Web.UI.csproj
	src/Umbraco.Web/umbraco.presentation/content.cs
Streamlines form error colors to be inline with the rest of our color scheme