New features

Issue #3020911 by agoja: Support for Ingest Attachment Processor Plugin

- add command for demo image creation.
- split list of images into chunks for conversion or resizing with multiple batch-processes. With this modifikation its possible to handle an unlimited amount of pictures without running into "connection timed out" problemes caused by long running batch process.
- fix some styling and code cleanup

Update resource's metadata and add customised headers in Transifex's API calls.

- Updated UI

Initial commit.

Initial version. This installs the library and runs it for anonymous users. No usable configuration exists.