Merge commit '91c7a287ed568e8ad6837be256ff90e7a7df01ad' into Translation

Conflicts:
	Signum.Web.Extensions/Mailing/Scripts/ckeditor.ts
more on translation
PlainExcelGenerator.ReadPlainExcel and
TranslatedInstanceLogic.SaveExcelFile
Merge branch 'Translation'

Conflicts:
	Signum.Web.Extensions/Translation/TranslatedInstanceSynchronizer.cs
	Signum.Web.Extensions/Translation/Views/ViewInstance.cshtml
	Signum.Web.Extensions/Translation/Views/ViewInstance.generated.cs
fix master back