There are both: po/it.po po/it_IT.po The strings are different. Only thunar-archive-plugin and xfdashboard have it_IT.po the rest uses it.po so i suggest using it.po. But i dont know if the strings from it.po or it_IT.po should be in the new it.po.
Probably because someone requested it_IT on transifex and that was granted: https://www.transifex.com/xfce/thunar-plugins/language/it_IT/ I think the locale should be removed from transifex if it makes sense and see how the script handles this.
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