Merge branch 'feature_pluginPreviews' into 'master'

Classes/Hooks/PageLayoutView/PluginRenderer.php

Configuration/FlexForms/Joblist.xml

Resources/Private/Language/de.locallang_backend.xlf

Resources/Private/Language/de.locallang_db.xlf

Resources/Private/Language/locallang_backend.xlf

Resources/Private/Language/locallang_db.xlf

...urces/Private/Partials/Backend/PluginDataTableHeader.html

Resources/Private/Templates/Backend/JobApplication.html

Resources/Private/Templates/Backend/JobTeaser.html

Resources/Private/Templates/Backend/Joblist.html

ext_localconf.php