diff --git a/app/assets/javascripts/check_all_none.js b/app/assets/javascripts/check_all_none.js
index fddfd1261..99301253f 100644
--- a/app/assets/javascripts/check_all_none.js
+++ b/app/assets/javascripts/check_all_none.js
@@ -2,15 +2,22 @@
   "use strict";
   App.CheckAllNone = {
     initialize: function() {
-      $("[data-check-all]").on("click", function() {
-        App.CheckAllNone.associated_fields($(this), "check-all").prop("checked", true);
-      });
-      $("[data-check-none]").on("click", function() {
-        App.CheckAllNone.associated_fields($(this), "check-none").prop("checked", false);
+      $(".check-all-none button").on("click", function() {
+        var fields = App.CheckAllNone.associated_fields($(this));
+
+        if ($(this).data("check-all")) {
+          fields.prop("checked", true);
+        } else if ($(this).data("check-none")) {
+          fields.prop("checked", false);
+        }
       });
     },
-    associated_fields: function(element, data_attribute) {
-      return $("[name='" + element.data(data_attribute) + "']");
+    associated_fields: function(element) {
+      if (element.data("field-name")) {
+        return $("[name='" + element.data("field-name") + "']");
+      } else {
+        return $("[type='checkbox']", element.closest("fieldset"));
+      }
     }
   };
 }).call(this);
diff --git a/app/components/admin/locales/form_component.html.erb b/app/components/admin/locales/form_component.html.erb
index 6c8bbb291..73d9ffb75 100644
--- a/app/components/admin/locales/form_component.html.erb
+++ b/app/components/admin/locales/form_component.html.erb
@@ -23,6 +23,10 @@
     <legend><%= attribute_name(:enabled) %></legend>
     <p class="help-text"><%= t("admin.locales.enabled_help_text") %></p>
 
+    <% if many_available_locales? %>
+      <%= render Shared::CheckAllNoneComponent.new %>
+    <% end %>
+
     <div class="collection-check-boxes">
       <%= f.collection_check_boxes(
         :enabled,
diff --git a/app/components/moderation/shared/index_component.html.erb b/app/components/moderation/shared/index_component.html.erb
index 67d30d8ef..3366784e3 100644
--- a/app/components/moderation/shared/index_component.html.erb
+++ b/app/components/moderation/shared/index_component.html.erb
@@ -9,10 +9,7 @@
 <% end %>
 
 <%= form_tag form_path, method: :put do %>
-  <ul class="check-all-none">
-    <li><%= button_tag t("shared.check_all"), type: "button", data: { check_all: field_name } %></li>
-    <li><%= button_tag t("shared.check_none"), type: "button", data: { check_none: field_name } %></li>
-  </ul>
+  <%= render Shared::CheckAllNoneComponent.new(field_name) %>
 
   <%= content %>
 
diff --git a/app/components/shared/check_all_none_component.html.erb b/app/components/shared/check_all_none_component.html.erb
new file mode 100644
index 000000000..a7c7eda30
--- /dev/null
+++ b/app/components/shared/check_all_none_component.html.erb
@@ -0,0 +1,12 @@
+<ul class="check-all-none">
+  <li>
+    <%= button_tag t("shared.check_all"),
+                   type: "button",
+                   data: { field_name: field_name, check_all: true } %>
+  </li>
+  <li>
+    <%= button_tag t("shared.check_none"),
+                   type: "button",
+                   data: { field_name: field_name, check_none: true } %>
+  </li>
+</ul>
diff --git a/app/components/shared/check_all_none_component.rb b/app/components/shared/check_all_none_component.rb
new file mode 100644
index 000000000..c03748f12
--- /dev/null
+++ b/app/components/shared/check_all_none_component.rb
@@ -0,0 +1,7 @@
+class Shared::CheckAllNoneComponent < ApplicationComponent
+  attr_reader :field_name
+
+  def initialize(field_name = nil)
+    @field_name = field_name
+  end
+end
diff --git a/spec/components/admin/locales/form_component_spec.rb b/spec/components/admin/locales/form_component_spec.rb
index ea2398f01..f2ea4be23 100644
--- a/spec/components/admin/locales/form_component_spec.rb
+++ b/spec/components/admin/locales/form_component_spec.rb
@@ -5,10 +5,9 @@ describe Admin::Locales::FormComponent do
   let(:enabled_locales) { %i[en nl] }
   let(:locales_settings) { Setting::LocalesSettings.new(default: default_locale, enabled: enabled_locales) }
   let(:component) { Admin::Locales::FormComponent.new(locales_settings) }
+  before { allow(I18n).to receive(:available_locales).and_return(%i[de en es nl]) }
 
   describe "default language selector" do
-    before { allow(I18n).to receive(:available_locales).and_return(%i[de en es nl]) }
-
     it "renders radio buttons when there are only a few locales" do
       render_inline component
 
@@ -34,4 +33,24 @@ describe Admin::Locales::FormComponent do
                                   selected: "Nederlands"
     end
   end
+
+  describe "buttons to check all/none" do
+    it "is not rendered when there are only a few locales" do
+      render_inline component
+
+      expect(page).not_to have_button "Select all"
+      expect(page).not_to have_button "Select none"
+    end
+
+    it "is rendered when there are many locales" do
+      allow(component).to receive(:select_field_threshold).and_return(3)
+
+      render_inline component
+
+      page.find(:fieldset, "Enabled languages") do |fieldset|
+        expect(fieldset).to have_button "Select all"
+        expect(fieldset).to have_button "Select none"
+      end
+    end
+  end
 end
diff --git a/spec/components/shared/check_all_none_component_spec.rb b/spec/components/shared/check_all_none_component_spec.rb
new file mode 100644
index 000000000..fcf1510fa
--- /dev/null
+++ b/spec/components/shared/check_all_none_component_spec.rb
@@ -0,0 +1,41 @@
+require "rails_helper"
+
+describe Shared::CheckAllNoneComponent do
+  it "generates a data-field-name attribute when a field name is given" do
+    render_inline Shared::CheckAllNoneComponent.new("ids[]")
+
+    expect(page).to have_button count: 2
+
+    page.find("li:first-child") do |check_all|
+      expect(check_all).to have_button "Select all"
+      expect(check_all).to have_css "button[type='button'][data-field-name='ids[]'][data-check-all]"
+      expect(check_all).not_to have_css "[data-check-none]"
+    end
+
+    page.find("li:last-child") do |check_none|
+      expect(check_none).to have_button "Select none"
+      expect(check_none).to have_css "button[type='button'][data-field-name='ids[]'][data-check-none]"
+      expect(check_none).not_to have_css "[data-check-all]"
+    end
+  end
+
+  it "does not generate a data-field-name attribute when no field name is given" do
+    render_inline Shared::CheckAllNoneComponent.new
+
+    expect(page).to have_button count: 2
+
+    page.find("li:first-child") do |check_all|
+      expect(check_all).to have_button "Select all"
+      expect(check_all).to have_css "button[type='button'][data-check-all]"
+      expect(check_all).not_to have_css "[data-check-none]"
+      expect(check_all).not_to have_css "[data-field-name]"
+    end
+
+    page.find("li:last-child") do |check_none|
+      expect(check_none).to have_button "Select none"
+      expect(check_none).to have_css "button[type='button'][data-check-none]"
+      expect(check_none).not_to have_css "[data-check-all]"
+      expect(check_none).not_to have_css "[data-field-name]"
+    end
+  end
+end
diff --git a/spec/system/admin/locales_spec.rb b/spec/system/admin/locales_spec.rb
index 46b5ee2a2..bdc4c6b18 100644
--- a/spec/system/admin/locales_spec.rb
+++ b/spec/system/admin/locales_spec.rb
@@ -51,4 +51,22 @@ describe "Locales management", :admin do
       expect(page).not_to have_link "English"
     end
   end
+
+  scenario "select all/none" do
+    allow_any_instance_of(Admin::Locales::FormComponent).to receive(:many_available_locales?).and_return(true)
+
+    visit admin_locales_path
+
+    within_fieldset "Enabled languages" do
+      expect(page).to have_field type: :checkbox
+
+      click_button "Select all"
+
+      expect(all(:checkbox)).to all(be_checked)
+
+      click_button "Select none"
+
+      all(:checkbox).each { |checkbox| expect(checkbox).not_to be_checked }
+    end
+  end
 end