Use translated namespaces

https://wikia-inc.atlassian.net/browse/HG-481

`namespaces` are used here: https://github.com/Wikia/mercury/blob/master/public/scripts/mercury/utils/articleLink.ts#L44
Small clarification: `MWNamespace::getCanonicalNamespaces()` returns *mostly always* namespaces in English. Proper way is to use content language and get the namespaces in a wikia language with English fallbacks.