Avoid using pluralize on moderation pages (#12589)

Pluralize function from Rails framework does not work with other
languages than English, moreover it does not even work properly with
English [1]. Not that the latest applies to this context, it's just
a sign that we best to avoid this function, especially when there are
more reliable ways.

This commit changes how reports pages generated in order to avoid usage
of pluralize function, replacing it with default translation function,
called with given counter. On top of that, we have to make strings
pluralizable, so have to change locale files.

[1]: https://medium.com/@anna7/b3927de2ca8e#6a60

config/locales/zh-TW.yml

@@ -323,9 +323,6 @@ zh-TW:
       created_msg: 檢舉記錄建立成功!
       destroyed_msg: 檢舉記錄刪除成功!
     reports:
-      account:
-        note: 條記錄
-        report: 條檢舉
       action_taken_by: 操作執行者
       are_you_sure: 你確定嗎?
       assign_to_self: 指派給自己