[BUGFIX] when 2 plugins are set on the same page only one will get loaded 1

Tasks:
 created unique id per instance of the plugin in html
 updated javascript to iterate over all instances of the plugin
 added more possibilieties for configuration on the element
 updated wizard.xml FlexForm configuration
 added translations for german
 added a translation key for load more
 bumped version

Resolves: 1