[Koha] Field 773 $t not editable in any framework

[Michael Kuhn]

Hi Jonathan

> Recreate against master, please open a new bug report.
> This is very weird, I did not manage to find why this tab causes problem.
> Did you find another one?

Thanks! I created the following bug:
* https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=17660

I remember having this problem before already (Koha 3.18) but I was 
solving it then using the editor. When meeting an error the first time I 
always think I have done something wrong myself...

If I'll find other tabs with this behaviour I will add notice about them 
to bug 17660.

Best wishes: Michael
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