i18n small refactoring: adds some missing translations; removes pluralize; no...

i18n small refactoring: adds some missing translations; removes pluralize; no concat in translation strings anymore (#1665)

* wip

* wip

* add bloocktrades to warning list

* cover image style fixes (#1660)

use background-size:cover and remove shadow from buttons, close #1659

* get rid of pluralize lib

* get rid of pluralize lib

* joined date done right

* show correct localized date