Resolve "Create own Quill input dialog"

Closes #633 and #636

See merge request arsnova/frag.jetzt!594

[Ticket: #636][Ticket: #633]

Resolve #630, #631, #632

Closes #630, #631, and #632

See merge request arsnova/frag.jetzt!591

[Ticket: #630][Ticket: #631][Ticket: #632]

explanation texts

See merge request arsnova/frag.jetzt!588

Resolve "Formatted text troubles DeepL"

Closes #617, #621, #623, #615, #626, #620, #622, and #624

See merge request arsnova/frag.jetzt!573

[Ticket: #615]

[Ticket: #626]

# Conflicts:
#	src/app/components/shared/_dialogs/deep-ldialog/deep-ldialog.component.html

[Ticket: #623]

[Ticket: #624]

A number of bugs have been reported,
some of which this commit should fix.

[Ticket: #617][Ticket: #620][Ticket: #621]
[Ticket: #622]

set the link of the feedback room to the room, since the question list can no longer be accessed directly

This reverts commit 9824887c.

Resolve "Implement DeepL API"

Closes #612

See merge request arsnova/frag.jetzt!567

Merge branch '614-make-vote-tooltip-available-for-student-too-add-up-downvotes-to-questionwall' into 'staging'

add score tooltop for students, add up down votes for questionwall

Closes #614

See merge request arsnova/frag.jetzt!570

During the last meeting, some problems were pointed out.
This commit should fix some of them.