Reuse `ParticipantStatusChangeEvent` record event, already used by emojis and
webcam streams, to record `UserRoleChangedEvtMsg`.

Role change is stored at `events.xml` as:

- promotion
```
  <event timestamp="2068340" module="PARTICIPANT" eventname="ParticipantStatusChangeEvent">
    <timestampUTC>1622384175759</timestampUTC>
    <date>2021-05-30T14:16:15.759Z</date>
    <status>role</status>
    <userId>w_fowyht7g0tfi</userId>
    <value>MODERATOR</value>
  </event>
```

- demotion
```
  <event timestamp="2071437" module="PARTICIPANT" eventname="ParticipantStatusChangeEvent">
    <timestampUTC>1622384178855</timestampUTC>
    <date>2021-05-30T14:16:18.855Z</date>
    <status>role</status>
    <userId>w_fowyht7g0tfi</userId>
    <value>VIEWER</value>
  </event>
```

Minor update to test build

fix: translate poll answer key for default polls in chat message

refactor(poll): improve poll types code

this also fixes certain poll type detection for other languages than english,
so that the correct poll type is sent in the events (they were being detected as custom)

refactor: redo how poll result chat message is done

* adds unability to see screenshare button on mobile devices test specs

* simplify code in testMobileDevice()

* userlist and chat panels should not appear at page load in mobile devices

* lint

* updates outdated audio specs due to leaveAudio changes

* correct clicks on disconnectAudio elements

* whiteboard not visible on userlistPanel or on chatPanel

* reworks mobile devices/usersagents

* fixes screenshare mobile/tablet specs

* adds whiteboardNotAppearOnMobile spec

* adds Chat Panel specification to Mobile-Tablet specs

* simplify getArgs() functions for all devices

fix: add padding to action bar dropdowns

Show the status of multiple nodejs workers and kurento media servers in bbb-conf status

feat: localization support for guest wait page

fix: handle additional cases for locales

refactor: removing unused imports/exports

fix: do not display private chat before first message is sent

fix: remove git add from linter config

fix: don't show empty line when poll have 7 answers

Fix prolems with ":" char in answers.
Respect poll question formatting (lineBreaks/spaces) in other fields of UI

fix: options button appearing in save chat

Improve Start A Poll button after publishing poll results

fix: ui adjustments for large te and km locales

fix(security): update postcss and postcss plugins

fix(security): update redis 2.8 -> 3.1

fix(chat): auto scroll to bottom for new users

refactor: remove useless conditionals