If you wish to contribute code, feel free to do so. The azw3 output plugin in in the writer8 folder. Search for lang in that folder. As far as I know the azw3 format has no support for anything other than ISO 639-1 lang codes, but if you have a azw3 file that does specify country code, you will have to use a hex editor to check how the country code is stored in the header and implement it in the azw3 output plugin. There is a description of the header fields of MOBI/AZW3 files in the mobileread wiki.
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