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I am not 100% sure what you are trying to achieve, but to me the provided string for your template should be formatted with double quotes around single quotes:
const Gallery = { template: "{{$t('gallery')}} <img :class='[[item.class]]' v-for='(item, index) in carousel' :src='[[item.img]]' alt='img' />" }
Could you please provide more context? Error output, etc…?
Source:stackexchange.com