While editing the default i18n files directly is effective, the recommended approach is to capture i18n changes in your theme. This ensures that your changes to the default values are easy to find and review and also removes the risk of losing your changes when upgrading to newer versions of DSpace.
This is to conform with DSpace recommendation of not modifying
src/assets/i18n/en.json5
file.https://wiki.lyrasis.org/display/DSDOC7x/User+Interface+Customization#UserInterfaceCustomization-CustomizeUIlabelsusingInternationalization(i18n)files