What are all the bundles you have restarted? And from the component how you are calling the i18n. Are you having separate i18n folder in /apps/yourproject and inside i18n folder are you having any .json file which would having i18n keys and values? Also what is the i18n dependency version you are using? Please share your inputs.
I have verified this abode helpx article i18n translations are no longer working . But this will helps only if you are working in some higher environments and if you are not logged in as Admin. Please have a try. In my case it is not workout since I'm trying in my local and logged in as Admin.