improve questionwall sort, sort by favorites, sort by user

Closes #358

See merge request arsnova/frag.jetzt!332

Merge branch '363-time-specifications-do-not-correspond-with-the-language-selection-german' into 'master'

de/en time format questionwall

Closes #363

See merge request arsnova/frag.jetzt!331

Person/user icon for questionwall button and comments

Closes #364

See merge request arsnova/frag.jetzt!330

Remove review apps step since deployment is changing

See merge request arsnova/frag.jetzt!328

add questionwall button i18n

Closes #361

See merge request arsnova/frag.jetzt!325

Merge branch '360-use-the-same-user-icon-on-the-question-wall-and-set-header-button-labels-apart' into 'master'

Resolve "Use the same user icon on the question wall and set header button labels  apart"

Closes #360

See merge request arsnova/frag.jetzt!324

Revert "Merge branch..."

See merge request arsnova/frag.jetzt!322

This reverts merge request !321

Merge branch '360-use-the-same-user-icon-on-the-question-wall-and-set-header-button-labels-apart' into 'master'

change questionwall icon, add person icon to questions, display answer, add...

Closes #360

See merge request arsnova/frag.jetzt!321

change questionwall icon, add person icon to questions, display answer, add questionwall button i18n

Highlight Questionwall button, add usernumber to questions

Closes #357

See merge request arsnova/frag.jetzt!320

Allow filtering for userid for moderator view

Closes #355

See merge request arsnova/frag.jetzt!319

i18n, sort, present question margin, button label uppercase-lowercase

Closes #354

See merge request arsnova/frag.jetzt!318

Merge branch '310-give-each-new-question-poser-a-consecutive-number-combined-with-an-icon-label-and-filter-questions-by-clicking-on-the-label' into 'master'

Give comment creators a 'userNumber', added as new filter

Closes #310

See merge request arsnova/frag.jetzt!280

Questionwall/Quizwall question vertically centered

Closes #350

See merge request arsnova/frag.jetzt!317

questionwall/quizwall keysupport, space or right-arrow for next comment,...

Closes #346

See merge request arsnova/frag.jetzt!316

questionwall/quizwall keysupport, space or right-arrow for next comment, left-arrow for prev comment

i18n support, introduction, fullscreen

Closes #340, #341, #342, #343, and #344

See merge request arsnova/frag.jetzt!315

Fix comment access

See merge request arsnova/frag.jetzt!314