* style.css: space was needed
* LocalizedText.resx: A Page Title for bill edition
* LocalizedText.Designer.cs: A Page Title for bill edition
* LocalizedText.fr.Designer.cs: A Page Title for bill edition
* LocalizedText.fr.resx: Page Title for bill edition
and drops the server side "Preview" notion, made obsolete by client side
MarkdownDeep js
* Edit.aspx: no more server side preview action
* YavscModel.csproj: no more server side preview action
* BlogEditEntryModel.cs: made osolete by MarkDown js
* BlogEditCommentModel.cs: made osolete by MarkDown js
* CalendarController.cs: removes useless spaces
* FrontOfficeApiController.cs: Makes the tex to pdf exceptions
available to the user interface, as part of the application process.
Cleans the using clauses.
* TexToPdfFormatter.cs: sets the filename as response header.
* Web.csproj: a new FormatterException, thrown when exit code of
texi2pdf is not null