This is actually a cms question, so I move it here. Are you trying to localize the UI in a language that is not builtin?
if you look deep inside `EPiServer.Cms.Shell.UI.dll` file - there is a collection of embedded resources (`EPiServer.Cms.Shell.EmbeddedLangFiles.OnlineCenter_*.xml`).
not quite sure (can't remember from top of my head as I'm getting older every day), but seems like these strings you are looking for are under:
What is the True way to localize settings header? I can't even find part of fields.
What should I add to ContnetTypes.lang.xml to localize, for examplr, field "Visible to"? And should I add something at all?