Improvements for edit page

[gerardo-navarro]

I have tested it locally, looks good. Maybe one improvement, which can be done in a different PR: The "saved" label feels a bit too shy. I don't have a perfect idea, but it feels too small and the location makes it easy to overlook. Actually I once hit the "Add idea" button to save :-D As of today, I can't give you a good mockup/ idea how to improve this. I noticed that many apps use something like "last updated at ..., saved." somewhere, to make it more clear.

See also https://ux.stackexchange.com/questions/103173/how-do-you-make-it-clear-to-the-user-when-the-data-in-a-table-is-updating-live

Two smaller issues:

• I think you missed to translate the "Saved." label. At least it didn't change for me when changing the locale to German.
• The error "This label is already associated to an idea" sometimes suddenly disappears and it makes it hard to read. But sometimes it stays endlessly...

Originally posted by @JannikStreek in https://github.com/mindwendel/mindwendel/issues/122#issuecomment-1046303942