UI bugs

[eikek]

This is a collection of some minor ui bugs encountered so far:

• when sending a mail it says "loading…"
• start-once button missing on notification task
• file name in detail view doesn't break. if too long, it enables horizontal scrolling
• when saving notes and navigating between items with and without note, the save button appears multiple times
• job qeue page doesn't show cancelled jobs

[eikek]

* when saving notes and navigating between items with and without note, the save button appears multiple times

This is only reproducible in firefox (85.0.1). Other (chromium based) browser I tried don't show this behaviour. It also is not reproducible in firefox 76.0.1

Edit: Well… turned out that the firefox extension "edit with emacs" is to blame for this.

[eikek]

Fixed in #753