Add i18n (english) for auto_remove_article #2

Reference : https://github.com/FreshRSS/FreshRSS/pull/694
Merge pull request #724 from Alwaysin/patch-5

Add i18n (english) for auto_remove_article #2
fix typo
Add comments
Fix a security issue in Minz_Error::error()

Mehtod must redirect automatically by default to avoid code execution after
calling the method.
Merge branch 'dev' into 252-extensions
Add a feed_before_insert hook

See https://github.com/FreshRSS/FreshRSS/issues/252