localeForChoice returns fallback if key doesn't exist

src/Illuminate/Translation/Translator.php

@@ -191,7 +191,7 @@ public function get($key, array $replace = [], $locale = null, $fallback = true)
     public function choice($key, $number, array $replace = [], $locale = null)
     {
         $line = $this->get(
-            $key, $replace, $locale = $this->localeForChoice($locale)
+            $key, $replace, $locale = $this->localeForChoice($key, $locale)
         );
 
         // If the given "number" is actually an array or countable we will simply count the
@@ -211,12 +211,21 @@ public function choice($key, $number, array $replace = [], $locale = null)
     /**
      * Get the proper locale for a choice operation.
      *
+     * @param  string $key
      * @param  string|null  $locale
      * @return string
      */
-    protected function localeForChoice($locale)
+    protected function localeForChoice($key, $locale)
     {
-        return $locale ?: $this->locale ?: $this->fallback;
+        if ($locale && $this->hasForLocale($key, $locale)) {
+            return $locale;
+        }
+
+        if ($this->hasForLocale($key, $this->locale)) {
+            return $this->locale;
+        }
+
+        return $this->fallback;
     }
 
     /**