Incomplete localization of `{{ entry.postDate.diff(now)|duration }}` In a Dutch site, when I output {{ entry.postDate.diff(now)|duration }}, the result is something like 5 dagen, 3 uren, 43 minuten, and 42 seconden. Why is the English "and" not localized? My understanding (I don't speak Dutch) is that "and" should be "en" in Dutch...

Am I missing some crucial step here? Thanks!
Because neither Craft (nor Yii) provides a default Dutch translation for the word "and".

https://github.com/craftcms/cms/tree/develop/src/translations

https://github.com/yiisoft/yii2/tree/master/framework/messages

You can provide your own translations using Craft's static translations feature, though: https://docs.craftcms.com/v3/static-translations.html