I tried to follow the docs here:
With this config.toml
baseURL = "http://example.org/"
defaultContentLang = "de"
languageCode = "de_DE"
title = "My New Hugo Site"
and this in index.html I don't get german localization.
<p>{{ .Date | time.Format ":date_full" }}</p>
<p>{{ .Date | time.Format ":date_long" }}</p>
<p>{{ .Date | time.Format ":date_medium" }}</p>
<p>{{ .Date | time.Format ":date_short" }}</p>
<p>{{ .Date | time.Format ":time_full" }}</p>
<p>{{ .Date | time.Format ":time_long" }}</p>
<p>{{ .Date | time.Format ":time_medium" }}</p>
<p>{{ .Date | time.Format ":time_short" }}</p>