Removed  unused `short` filter from app.js.
Removed unused `shortPath` filter from app.js.
Removed unused `clean` filter from app.js.
Removed unused `optionEditor` directive from app.js
Add pyfisch
Merge remote-tracking branch 'origin/pr/634'

* origin/pr/634:
  Removed unused `optionEditor` directive from app.js
  Removed unused `clean` filter from app.js.
  Removed unused `shortPath` filter from app.js.
  Removed  unused `short` filter from app.js.
Update assets
Translation update (add Catalan)
Don't stop permanently on exit (fixes #637)
Don't start the browser on restarts (fixes #636)