added missig translation as reported by checker.py:

Errors found in it.yml:
- settings.ui is missing keys: scroll_to_read, sidebar_unread_only
- pages is missing keys: status, blog, donate, community
- home has extra keys: aboutus, plugins
- import is missing keys: too_many_feeds, started, queued_notice, queued, cancel
- import has extra keys: success
- notifier is missing keys: import