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 (", ").