Added classes to elements with only an ID

Translation update (uk)

Translation update (it)

Translation update (zh)

Translation update (kn)

add rss_media config values translations

not perfect, but it works

Translation update (sv)

Per request of @splitbrain

Translation update (de-informal)

Translation update (ru)

Update French translation

Translation update (fr)

Translation update (uk)

Translation update (lv)

prevent hidden pages to be shown in trace

Support for configurable e-mail return path

This adds some simple defaults for the guaranteed placeholders. This
ensures plugins can safely use these placeholders even when a template
did not implement them.

Make security.png more descriptive

Translation update (sv)

Translation update (fr)

Translation update (de)