fix translation files

update seed scripts to prevent sql error when reloading install page

- tempfile uniqueness ensures that each process lives in its independent context
- add
writable/temp folder to store video clips temporary resources
- add videoClipWorkers config to
Admin for specifying the number of ffmpeg processes to run in parallel
- update video clip preview
background to better suit the end result

rename episode activity cache

update job duration label for video clips list

removing the css extension prevents having the file hijacked by the web server config

set two toggle switches to run housekeeping tasks seperately if needed