Expose NavigationNode.TitleResource in CSOM & JSOM
You can already localize using SetValueForUICulture() for TitleResource or NameResource and DescriptionResource properties of Web, List, ContentType, and Field. What is missing is the ability to do this for NavigationNode and maybe CommandUIExtension to make localization complete.
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Navigation node(QuickLaunch) should have ability to update titleresource