<fmt:message> is not there with sling. as @edubey mentioned use i18n.get()However, make sure you have all the dictionary built for the words you need.Refer these which might help1. https://docs.adobe.com/docs/en/aem/6-0/develop/components/i18n/i18n-dev.html2, https://docs.adobe.com/docs/en/aem/6-0/d...