Klageautomat/Untätigkeitsklage: Cross-check entered dates against data of FOI request history

[rugk]

Follow-up of #221

Feature request

The dates entered should be cross-checked against the dataset from the IFG request.
I.e. if I e.g. enter that I got an administrative decision (Bescheid) on 2020-12-12, but no such document is available in the FOI request, it should warn me to prevent accidental mistakes.

Also it could check whether there is a (PDF) attachment on that request and show a warning if there is no one.

What should happen

A warning (yellow box) like this:

Sie haben ein Datum angegeben, zu dem kein dazugehöriges Anfragedokument [mit angehängert PDF-Datei] gefunden wurde. Falls dieses noch nicht hochgeladen wurde oder ein falsches Datum angegeben wurde, so empfehlen wir, dies zunächst hochzuladen bzw. zu korrigieren, bevor sie weiter fortfahren.
[Trotzdem fortfahren]

I.e.

• warn about the problematic fact
• suggest to upload the document first or correct the date in the request if that is wrong
• still allow one to continue, if one e.g. did not want to upload it with the date or chose a somewhat different date (e.g. the date one has received the document vs it was written or so) or the agency really choose a non-PDF format or such arcane things

Reasoning/background

This helps to:

• spot easy mistakes/typos in your date
• prevent some easy mistakes, where you chose the wrong request date where you only received a notice and no formal PDF document

It's similar to the usual, manual complaint request process, where you also extract all dates and display it as a option list. There, one cannot even enter any non-existant date, but IMHO it is fine for the automatic one, as one may just have missed uploading it or does not want to upload it etc.