Create labels for custom taxonomy
<?php
add_filter('frameshift_portfolio_skills_labels', 'custom_portfolio_skills_labels', 30);
function frameshift_portfolio_skills_labels($labels) {
$labels = array(
'name' => _x( 'Skills', 'skills', 'frameshift' ),
'singular_name' => _x( 'Skill', 'skills', 'frameshift' ),
'search_items' => _x( 'Search Skills', 'skills', 'frameshift' ),
'popular_items' => _x( 'Popular Skills', 'skills', 'frameshift' ),
'all_items' => _x( 'All Skills', 'skills', 'frameshift' ),
'parent_item' => _x( 'Parent Skill', 'skills', 'frameshift' ),
'parent_item_colon' => _x( 'Parent Skill:', 'skills', 'frameshift' ),
'edit_item' => _x( 'Edit Skill', 'skills', 'frameshift' ),
'update_item' => _x( 'Update Skill', 'skills', 'frameshift' ),
'add_new_item' => _x( 'Add New Skill', 'skills', 'frameshift' ),
'new_item_name' => _x( 'New Skill', 'skills', 'frameshift' ),
'separate_items_with_commas' => _x( 'Separate skills with commas', 'skills', 'frameshift' ),
'add_or_remove_items' => _x( 'Add or remove skills', 'skills', 'frameshift' ),
'choose_from_most_used' => _x( 'Choose from the most used skills', 'skills', 'frameshift' ),
'menu_name' => _x( 'Skills', 'skills', 'frameshift' )
);
return $labels;
}