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There is one glitch. The Estonian Wikipedia is known as et.wikipedia.org. The ISO-639-1 et code is connected to the ISO-639-3 est code, and this just became a macro language. Standard Estonian has been given its own code of ekk.
It is quite clear that technically it would be preferable to rename the Estonian Wikipedia. It can be done, this will be demonstrated with the rename of the Võro Wikipedia. From a community perspective it is not so clear cut. People are conservative, they do not like change and there are a lot of references out their to the Estonian Wikipedia.
For the Võro community, it is a badge of pride to have their own ISO-639-3 code. For the Estonian community it is a nuisance.
Thanks,
Gerard