#869 Export month without expanding it

[Michib]

Hey Jabref-Team,

I'm using custom export filters to create html code and separate bib-files according certain search criteria.

In total this is fine, but when creating new bib files, it is annoying that the month field gets automatically expanded (i.e., sep -> September, etc.).

Can you add a formatter that completely prevents the expansion of the month field but puts it as it is (e.g., things like month={10-12} # aug) ?

Thanks