for default language (English) you can find it at
/jomsocial/language/en-GB/en-GB.com_community.ini
COM_COMMUNITY_EMAIL_REGISTRATION_REQUIRES_ACTIVATION
COM_COMMUNITY_EMAIL_REGISTRATION
COM_COMMUNITY_EMAIL_REGISTRATION_COMPLETED_REQUIRES_ADMIN_ACTIVATION
COM_COMMUNITY_EMAIL_REGISTRATION_COMPLETED_REQUIRES_ACTIVATION
if using multiple language you can find it at /jomsocial/language/[lang code]/[lang code].com_community.ini
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