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AFAIK calibre uses an international standard for it's language coding, which means new entries can't be added, or existing ones changed or removed.
In the main, Calibre uses the standards defined by the International Digital Publishing Forum (IDPF). Language is one of the elements of the IDPF standards, it is used in dictionary lookup functions in ebook readers, spellcheckers etc.
I suggest you use another column to indicate the book is a picture book, e.g. '!Pictogram' in the Tags column, or create a tag-like custom column (eg 'Admin Tags') and put it in there.
BR
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