Copy locale only if previous entity has a specific one

src/Carbon/CarbonPeriod.php

@@ -1446,10 +1446,11 @@ public function rewind()
         $this->key = 0;
         $this->current = call_user_func([$this->dateClass, 'make'], $this->startDate);
         $settings = $this->getSettings();
-        $locale = $this->getTranslatorLocale();
-        if ($locale) {
-            $settings['locale'] = $locale;
+
+        if ($this->hasLocalTranslator()) {
+            $settings['locale'] = $this->getTranslatorLocale();
         }
+
         $this->current->settings($settings);
         $this->timezone = static::intervalHasTime($this->dateInterval) ? $this->current->getTimezone() : null;
 

src/Carbon/Traits/Creator.php

@@ -99,7 +99,13 @@ public static function instance($date)
         $instance = new static($date->format('Y-m-d H:i:s.u'), $date->getTimezone());
 
         if ($date instanceof CarbonInterface || $date instanceof Options) {
-            $instance->settings($date->getSettings());
+            $settings = $date->getSettings();
+
+            if (!$date->hasLocalTranslator()) {
+                unset($settings['locale']);
+            }
+
+            $instance->settings($settings);
         }
 
         return $instance;

src/Carbon/Traits/Localization.php

@@ -137,6 +137,16 @@ public static function setTranslator(TranslatorInterface $translator)
         static::$translator = $translator;
     }
 
+    /**
+     * Return true if the current instance has its own translator.
+     *
+     * @return bool
+     */
+    public function hasLocalTranslator()
+    {
+        return isset($this->localTranslator);
+    }
+
     /**
      * Get the translator of the current instance or the default if none set.
      *