Sorry about that, Russ. As one of our community members pointed out, you need to make sure the <resource-bundle> element is in the right order of elements within the <portlet> element. https://www.liferay.com/documentation/liferay-portal/6.1/development/-/ai/localize-your-portlet#_2_WAR_assetimporterportlet_message_27277976

I'm updating the text to clarify that. Thanks.