fix expand button

Closes #602

See merge request arsnova/frag.jetzt!691

Resolve "Always give spaCy the back translation from DeepL"

Closes #668

See merge request arsnova/frag.jetzt!690

Merge branch '593-threshold-selection-for-the-display-of-questions-having-no-function' into 'staging'

Resolve "Threshold selection for the display of questions having no function"

Closes #593

See merge request arsnova/frag.jetzt!689

Resolve "Put some notorious keywords on the blacklist for all rooms"

Closes #659, #669, and #670

See merge request arsnova/frag.jetzt!685

Resolve "Fix not working profanity filter"

Closes #691

See merge request arsnova/frag.jetzt!686

Resolve #673, #689, #690

Closes #673, #689, and #690

See merge request arsnova/frag.jetzt!684

Resolve "Improve the input of categories"

Closes #687 and #688

See merge request arsnova/frag.jetzt!676

# Conflicts:
#   src/app/components/shared/comment/comment.component.scss

User statistics

See merge request arsnova/frag.jetzt!678

Merge branch '686-place-a-counter-at-the-user-number-icon-to-show-the-number-of-questions-of-this-user' into 'staging'

Resolve "Place a counter at the user number icon to show the number of questions of this user"

Closes #686

See merge request arsnova/frag.jetzt!674

Revert "Merge branch..."

See merge request arsnova/frag.jetzt!677

This reverts merge request !671

Merge branch 'staging' into 686-place-a-counter-at-the-user-number-icon-to-show-the-number-of-questions-of-this-user

Revert "Merge branch..."

See merge request arsnova/frag.jetzt!675