diff --git a/CHANGELOG.md b/CHANGELOG.md
index a3ca98189..7079d2c26 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,7 @@
 - Fix a bug: installation without nginx does not remove the service from the docker-compose file
 - Fix a bug: default twitter feed is invalid
 - Fix a bug: default nginx configuration does not allows secure cookies
+- Fix a bug: in-context translation is loading invalid locale for MessageFormat
 
 ## v4.3.3 2020 April 1st
 
diff --git a/app/views/application/index.html.erb b/app/views/application/index.html.erb
index 226d14a8f..4350be3b4 100644
--- a/app/views/application/index.html.erb
+++ b/app/views/application/index.html.erb
@@ -139,9 +139,6 @@
 
 <!-- i18n of external libraries -->
 <script type="text/javascript" src="<%= asset_path "angular-i18n/angular-locale_#{Rails.application.secrets.angular_locale}.js" %>"></script>
-<% if Rails.env.staging? && Rails.application.secrets.enable_in_context_translation %>
-  <script type="text/javascript">MessageFormat.locale.ach=function(n){return n===0||n===1?"one":"other"};</script>
-<% end %>
 <!-- if required locale does not exist, use the default "en" -->
 <% if asset_available?("moment/locale/#{Rails.application.secrets.moment_locale}.js") %>
   <script type="text/javascript" src="<%= asset_path "moment/locale/#{Rails.application.secrets.moment_locale}.js" %>"></script>