1.0 The template tag library was called placeholder_tags
in the past.
fluent_contents.templatetags.fluent_contents_tags
fluent_contents.templatetags.fluent_contents_tags.PagePlaceholderNode
fluent_contents.templatetags.fluent_contents_tags.RenderPlaceholderNode
fluent_contents.templatetags.fluent_contents_tags.RenderContentItemsMedia