#19 node raw and text does not show the files of a folder (state: open)

see https://github.com/MetaModels/attribute_file/issues/63

note: https://github.com/MetaModels/attribute_file/issues/63#issuecomment-371298662

Current check:

• in the text node all files of a folder are listed - fixed in MM 2.2
• opposite untranslated file here is the list with comma + space , vs. , - fixed in MM 2.2
• with text and html5 node files are shown twice if folder and file are selected
• the differentiation between languages does not work - only EN is displayed in the test case (fallback DE)
• Consider adding an option to the render settings so that when you select a folder, the files appear in the raw node - this is the only place where you have access to the metadata. @discordier ?