Hello, @Misa Mimic,
Those tabs are coming from the MultiVendor plugin you are using on your site, Dokan OR WCFM, so you have to check and translate in plugin language files, like If you are using the Dokan MultiVednor plugin, then you have to translate it under Loco >> Plugins >> Dokan
Otherwise, you have to try with the Custom Code, please read the below-listed threads:
https://wordpress.org/support/topic/change-vendor-info-title-text/
Regards 8Themes Team.