Resolve "Weighting in the Topic Cloud is not correct"

Closes #665, #668, and #669

See merge request arsnova/frag.jetzt!647

[Ticket: #669]

[Ticket: #668]

[Ticket: #665]

Resolve "Fix regular expressions"

Closes #664

See merge request arsnova/frag.jetzt!644

Resolve "Do not offer question analysis if there are no questions"

Closes #658, #660, and #661

See merge request arsnova/frag.jetzt!641

Resolve "Mask more characters in the topic cloud"

Closes #659

See merge request arsnova/frag.jetzt!640

Resolve "Remove typographic quotes from the topic cloud"

Closes #657

See merge request arsnova/frag.jetzt!636

Merge branch '656-after-the-analysis-run-has-finished-update-the-number-of-keywords-in-the-dialog-box' into 'staging'

Resolve "After the analysis run has finished, update the number of keywords in the dialog box"

Closes #656

See merge request arsnova/frag.jetzt!635

Resolve "Offer question analysis for all user roles"

Closes #655

See merge request arsnova/frag.jetzt!632

Resolve "Reduce access rates"

Closes #654

See merge request arsnova/frag.jetzt!630

Resolve "Refactor polling on the question overview"

Closes #619

See merge request arsnova/frag.jetzt!628

Remove polling for comments.

Resolve "Add special update function for keyword generation"

Closes #653

See merge request arsnova/frag.jetzt!624

Resolve "Apply the profanity function also to the keywords"

Closes #651

See merge request arsnova/frag.jetzt!622

Resolve "No keywords are generated for the topic cloud"

Closes #650

See merge request arsnova/frag.jetzt!621