Update Russian translation (#4407)

* Add Russian translation (ru)

* Fix a missing comma

* Fix the wording for better consistency

* Update Russian translation

* Arrange Russian setting alphabetically

* Fix syntax error

* Update Russian translation

* Fix formatting error

* Update Russian translation

* Update Russian translation

* Update ru.jsx

* Fix syntax error

* Remove two_factor_auth.warning (appears obsolete)

* Add missing strings in ru.yml

A lot of new strings translated, especially for the newly added admin section

* Fix translation consistency

* Update Russian translation

* Update Russian translation (pluralizations)

* Update Russian translation

* Update Russian translation

* Update Russian translation (pin)

* Update Russian translation (account deletion)

* Fix extra line

* Update Russian translation (sessions)

* Update Russian translation

config/locales/ru.yml

@@ -267,6 +267,21 @@ ru:
     next: След
     prev: Пред
     truncate: "…"
+  push_notifications:
+    favourite:
+      title: "Ваш статус понравился %{name}"
+    follow:
+      title: "%{name} теперь подписан(а) на Вас"
+    mention:
+      action_boost: Продвинуть
+      action_expand: Развернуть
+      action_favourite: Нравится
+      title: "Вас упомянул(а) %{name}"
+    reblog:
+      title: "%{name} продвинул(а) Ваш статус"