add-translation-categories-tecc.php

<?php
/**
 * Plugin Name:       Add Categories for WMPL translated sites and Category Colors
 * Plugin URI:        https://gist.github.com/afragen/f9f1a9558258065afe7dab30557c50f4
 * Description:       Add translated categories to The Events Calendar for The Events Calendar Category Colors.
 * Version:           0.1
 * Author:            Andy Fragen
 * License:           MIT
 * Requires at least: 5.2
 * Requires PHP:      7.0
 * Gist Plugin URI:   https://gist.github.com/afragen/f9f1a9558258065afe7dab30557c50f4
 */

// If using WPML you must ensure that Event Categories (tribe_events_cat) are not translated.

add_filter(
	'teccc_add_terms',
	function() {
		$translated_terms = [
			'annual',
			'corve',
			'course-training',
			'ice-climbing',
			'indoor-climbing',
			'outdoor-climbing',
			'hiking-trekking',
			'cross-country-ski',
			'touring-ski',
			'alpine-route-ski',
			'telemark-ski',
			'annuel',
			'corvee',
			'cours-formation',
			'escalade-de-glace',
			'escalade-en-salle',
			'escalade-exterieur',
			'randonnee',
			'ski-de-fond',
			'ski-de-randonnee',
			'ski-haute-route',
			'ski-telemark',
		];

		return $translated_terms;
	}
);

// Primary French / / English /// English slug //// French slug
// Annuel // Annual /// annual //// annuel
// Corvée // Corvé ///  corve //// corvee
// Cours/ Formation // Course / Training /// course-training //// cours-formation
// Escalade de glace // Ice Climbing /// ice-climbing //// escalade-de-glace
// Escalade en Salle // Indoor Climbing /// indoor-climbing //// escalade-en-salle
// Escalade extérieur // Outdoor Climbing /// outdoor-climbing //// escalade-exterieur
// Randonnée // Trekking /// hiking-trekking //// randonnee
// Ski de fond // Country Ski ///  cross-country-ski //// ski-de-fond
// Ski de randonnée // Touring Ski /// touring-ski //// ski-de-randonnee
// Ski haute route // Alpine Route Ski /// alpine-route-ski //// ski-haute-route
// Ski Télémark // Telemark Ski /// telemark-ski //// ski-telemark