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function bp_rename_profile_tabs() {

	buddypress()->members->nav->edit_nav( array( 
		'name' => __( 'Dashboard', 'textdomain' ),
		'slug' => __( 'dashboard', 'textdomain' )
	), 'activity' );
  
}
add_action( 'bp_actions', 'bp_rename_profile_tabs' );