#520 Media manager: implemented re-upload from file / image properties window
#872 Re-designed page properties languages form
#878 Site settings -> languages: fixed IE bug; fixed ko.grid's add new row bug, when row is already added;
#881 Added language attribute to modal div
#882 Fixed pages filtering when selecting page for translation
Merge branch 'dev' into dev-multiple-sitemaps

Conflicts:
	Modules/BetterCms.Module.Pages/BetterCms.Module.Pages.csproj