i18n: Russian localization update (#10515)

* i18n: Updated ru.json for Russian language

* i18n: Updated ru.yml

* Normalize ru.yml

* i18n: Updated simple_form.ru.yml

* i18n: Updated activerecord.ru.yml, devise.ru.yml, normalized strings

* Added new strings to ru.json

* Deleted unused (?) string

* i18n: Added recent strings (Settings refactor)

config/locales/activerecord.ru.yml

@@ -1,6 +1,10 @@
 ---
 ru:
   activerecord:
+    attributes:
+      poll:
+        expires_at: Крайний срок
+        options: Варианты
     errors:
       models:
         account: