Enable I18N.

user/config/system.yaml

 absolute_urls: false
-timezone: ''
-default_locale: null
+timezone: 'Europe/Paris'
+default_locale: en
 param_sep: ':'
 wrapped_site: false
 reverse_proxy_setup: false
@@ -9,9 +9,12 @@ force_lowercase_urls: true
 custom_base_url: ''
 username_regex: '^[a-z0-9_-]{3,16}$'
 pwd_regex: '.{3,}'
-intl_enabled: false
+intl_enabled: true
 languages:
   supported:
+    - en
+    - fr
+    - es
   include_default_lang: true
   translations: true
   translations_fallback: true
@@ -19,7 +22,7 @@ languages:
   http_accept_language: false
   override_locale: false
 home:
-  alias: /home
+#  alias: /home
   aliases:
     en: /home
     fr: /home