Update i18n_l10n.md

docs/general/i18n_l10n.md

@@ -52,6 +52,13 @@ For example, for Spanish CiviCRM core:
 
 ```sh
 wget https://download.civicrm.org/civicrm-l10n-core/mo/es_ES/civicrm.mo
+```
+
+For the CDN Tax Receipts extension in Canadian French:
+
+```sh
+wget https://download.civicrm.org/civicrm-l10n-extensions/mo/cdntaxreceipts/fr_CA/cdntaxreceipts.mo
+```
 
 ## Storing translation files in another directory
 
@@ -70,3 +77,19 @@ To enable it:
 
 ```sh
 locale -a
+```
+
+Debian/Ubuntu systems can enable locales by typing:
+
+```sh
+dpkg-reconfigure locales
+```
+
+!!! note
+    The "UTF-8" variant of the locale must be enabled. For example: "fr_FR.UTF-8".
+
+Apache or PHP-FPM must be restarted after adding a new locale. Finally, uncomment the following in civicrm.settings.php:
+
+```php
+define('CIVICRM_GETTEXT_NATIVE', 1);
+```