Add option to reduce motion (#5393)

* Add option to reduce motion

* Use HOC to wrap all Motion calls

* fix case-sensitive issue

* Avoid updating too frequently

* Get rid of unnecessary change to _simple_status.html.haml

config/locales/simple_form.en.yml

@@ -39,6 +39,7 @@ en:
         otp_attempt: Two-factor code
         password: Password
         setting_auto_play_gif: Auto-play animated GIFs
+        setting_reduce_motion: Reduce motion in animations
         setting_boost_modal: Show confirmation dialog before boosting
         setting_default_privacy: Post privacy
         setting_default_sensitive: Always mark media as sensitive