The next tag works great:
But the substituted value starts with a capital and is in English, ie. "May". Is there a way to change the language / locale of this tag or the document? Ie.
<rssitemmonthname lang="nl-NL" />
At this stage i'm afraid that's not possible, although it definitely something we're considering. I'll add your vote to the feature request, along with your implementation suggestions.
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