diff --git a/.eslintignore b/.eslintignore
index d6ce39636bd04fb3e3c9c10203d50d42f5284d14..1623b996213f9227fcd0b7db46b8d5911acc9603 100644
--- a/.eslintignore
+++ b/.eslintignore
@@ -8,4 +8,4 @@
 karma.config.js
 webpack.config.js
 svg.config.js
-/app/assets/javascripts/locale/**/*.js
+/app/assets/javascripts/locale/**/app.js
diff --git a/app/assets/javascripts/locale/index.js b/app/assets/javascripts/locale/index.js
index 7ba676d6d20aa0d568b29f10d98c5d76317b0d50..6a5084efeb81abb7c091c150997577303093ae5f 100644
--- a/app/assets/javascripts/locale/index.js
+++ b/app/assets/javascripts/locale/index.js
@@ -16,9 +16,8 @@ const locales = allLocales.reduce((d, obj) => {
   return data;
 }, {});
 
-let lang = document.querySelector('html').getAttribute('lang') || 'en';
-lang = lang.replace(/-/g, '_');
-
+const langAttribute = document.querySelector('html').getAttribute('lang');
+const lang = (langAttribute || 'en').replace(/-/g, '_');
 const locale = new Jed(locales[lang]);
 
 /**