Default language suddenly not working?

Seen two problems with your config

  1. top level keys below a table definition won’t work. (see TOML Table

    move your pagination settings behind the last top level key (after line 25)

  2. your disableLanguages is an array of arrays, should be a simple string array

    correct disableLanguages to be a plain array: disableLanguages = ["en"]

toml adjusted
######################## default configuration ####################
# The base URL of your site (required). This will be prepended to all relative URLs.
baseURL = "/"
# Title of your website (required).
title = "Jana Schatto"

# Your theme name
theme = "hugoplate"
# Default time zone for time stamps; use any valid tz database name: https://en.wikipedia.org/wiki/List_of_tz_database_time_zones#List
timeZone = "Europe/Amsterdam"
timeout = "80s"
# post pagination
# post excerpt
summaryLength = 10 # see https://gohugo.io/content-management/excerpts/
# disable language
disableLanguages = ["en"]
# example: ["fr"] for disable french language. see https://gohugo.io/content-management/multilingual/
hasCJKLanguage = false #  If hasCJKLanguage true, auto-detect Chinese/Japanese/Korean Languages in the content. see: https://gohugo.io/getting-started/configuration/#hascjklanguage
# default language
defaultContentLanguage = "nl"
# defaultContentLanguageInSubdir need to be true if you want to use the language code as a subdirectory and language specific 404 page
defaultContentLanguageInSubdir = true

[pagination]
  pagerSize = 2 # see https://gohugo.io/extras/pagination/