diff --git a/Gemfile.lock b/Gemfile.lock
index 7aec7df51..b5dc1a5c4 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -114,7 +114,7 @@ GEM
     globalid (0.4.2)
       activesupport (>= 4.2.0)
     govuk_ab_testing (2.4.2)
-    govuk_app_config (2.8.4)
+    govuk_app_config (2.9.1)
       logstasher (>= 1.2.2, < 2.2.0)
       sentry-raven (~> 3.1.1)
       statsd-ruby (~> 1.5.0)
diff --git a/config/locales/plurals.rb b/config/locales/plurals.rb
index 2f0389f13..e69a1fcfd 100644
--- a/config/locales/plurals.rb
+++ b/config/locales/plurals.rb
@@ -1,34 +1 @@
-{
-  # Dari - this isn't an iso code. Probably should be 'prs' as per ISO 639-3.
-  dr: { i18n: { plural: { keys: %i[one other], rule: ->(n) { n == 1 ? :one : :other } } } },
-  # Latin America and Caribbean Spanish
-  "es-419": { i18n: { plural: { keys: %i[one other], rule: ->(n) { n == 1 ? :one : :other } } } },
-  # Scottish Gaelic
-  gd: { i18n: { plural: { keys: %i[one two few other],
-                          rule:
-                            lambda do |n|
-                              if [1, 11].include?(n)
-                                :one
-                              elsif [2, 12].include?(n)
-                                :two
-                              elsif [3, 4, 5, 6, 7, 8, 9, 10, 13, 14, 15, 16, 17, 18, 19].include?(n)
-                                :few
-                              else
-                                :other
-                              end
-                            end } } },
-  # Armenian
-  hy: { i18n: { plural: { keys: %i[one other], rule: ->(n) { n == 1 ? :one : :other } } } },
-  # Kazakh
-  kk: { i18n: { plural: { keys: %i[one other], rule: ->(n) { n == 1 ? :one : :other } } } },
-  # Punjabi Shahmukhi
-  "pa-pk": { i18n: { plural: { keys: %i[one other], rule: ->(n) { n == 1 ? :one : :other } } } },
-  # Sinhalese
-  si: { i18n: { plural: { keys: %i[one other], rule: ->(n) { n == 1 ? :one : :other } } } },
-  # Uzbek
-  uz: { i18n: { plural: { keys: %i[one other], rule: ->(n) { n == 1 ? :one : :other } } } },
-  # Chinese Hong Kong
-  "zh-hk" => { i18n: { plural: { keys: %i[one other], rule: ->(n) { n == 1 ? :one : :other } } } },
-  # Chinese Taiwan
-  "zh-tw" => { i18n: { plural: { keys: %i[one other], rule: ->(n) { n == 1 ? :one : :other } } } },
-}
+GovukI18n.plurals