Release 2.32 (#5411)

* bump packages
* dynamic invoice options
* make sure that invoice previews can be detected
* support for mpdf associated files
* do not include any future times in work contract calculation
* re-add username column in Excel spreadsheet
* deactivate internal rate editing
* show if plugin update exists
* shorten name to Kimai only, without Time-Tracking
* remove check for existing id in work contract
* fix metafield already defined in search
* helper methods to unlock months
* new translation
* send event on unlock month

composer.json

@@ -30,6 +30,7 @@
         "doctrine/doctrine-bundle": "^2.7",
         "doctrine/doctrine-migrations-bundle": "^3.3",
         "doctrine/orm": "^2.8",
+        "easybill/zugferd-php": "^2.1",
         "endroid/qr-code": "^4.8",
         "erusev/parsedown": "^1.6",
         "friendsofsymfony/rest-bundle": "^3.0",