Merge branch 'development' into 'master'

app/DynamicEngineParameters.php

app/MetaGer.php

app/Models/Searchengine.php

resources/lang/de/metaGer.php

resources/lang/de/plugin-page.php

resources/lang/en/plugin-page.php

resources/lang/es/plugin-page.php

resources/less/metager/pages/resultpage/result-page.less

resources/views/parts/custom-daterange.blade.php

resources/views/parts/filter.blade.php

resources/views/plugin-page.blade.php

resources/views/settings/index.blade.php