Lists i18n: how to enter double and for last two items
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In Chechen language, when you mean "and", you must write "and" two times. Example: Chechnya а, Russia а.
MediaWiki:Math-search-relation-0/ce а, MediaWiki:Smw finallistconjunct/ce а.
As far as I can see the first one is no used in lists. SMW does not allow localisation of the comma at all.
For MediaWiki core there is And (" and
") and Comma-separator (", 
").