diff --git a/_includes/locale/Locale.php b/_includes/locale/Locale.php
index fd5fcd2..1801e9d 100644
--- a/_includes/locale/Locale.php
+++ b/_includes/locale/Locale.php
@@ -18,11 +18,13 @@ public static function currentLocale() {
     }
 
     /**
-     * Override the current locale
+     * Validate and override the current locale
      * @param $locale - the new current locale (xx-YY as specified in crowdin %locale%)
      */
     public static function overrideCurrentLocale($locale) {
-      Locale::$currentLocale = $locale;
+      if (Locale::validateLocale($locale)) {
+        Locale::$currentLocale = $locale;
+      }
     }
 
     /**
@@ -32,7 +34,11 @@ public static function overrideCurrentLocale($locale) {
      * @return true if valid locale
      */
     public static function validateLocale($locale) {
+      if(preg_match('/^[[:alpha:]]{2,3}(-[[:alpha:]]{2,3})?$/i', $locale)) {
+        return true;
+      }
 
+      return false;
     }
 
     /**