Implement store-team list in Vue

This is a part of &22 (closed) which closes #820 (closed) and also closes #104 (closed).

What does this MR do?

Reimplements the store-team list in Vue:

• layout adjustments for all pages(!) - main content is now 12/24 wide, was 13/24 before
• store managers are now always displayed before regular members
  (and the no longer needed box of store managers is removed)
  => sleeping head keeps them up top, but in last place
• better visual separation for unverified members
• increase avatar size to 50px, matching pickup slot size now
  (moved fetchcount display into a badge to obtain some space)
• colored border for avatar is removed (not helpful in this context)
  (and only the avatar itself links to user profiles now)
  => fetchcount border is colored green now if store manager quiz was passed. orange border is gone. this stuff should become icons after !1052 (closed) handles it better.
• call button (prefers 'handy' over 'telefon') on screen sizes smaller than -md
  (this should be more visible than tapping on the phone numbers to call)
  => both numbers are validated and only valid numbers can be called
• b-tooltips + mobile tooltip replacement (with a different layout)
• (re)moved CSS and several translations
  (and translated a few strings that weren't before)
• better visual distinction of waiting-list members (star badge)
• remove context menu and reimplement as table details (click on username)
  directly reporting users from stores was removed, can just use the profile button and report there
• add confirmation popup for removing users from store team
• much better accessibility awareness for this component
• code preparations for potential client-side sorting by last pickup / fetchcount / joindate etc
  (if you're interested, build virtual columns and sort them!)
• add a few acceptance tests for the member actions, fixing #104 (closed) while at it

How confident are you it won't break things if deployed?

Well. Let's see.

• the global layout modification (left column width increased by 20% compared to before) might cause some unexpected stuff down the road, but shouldn't break
• the tooltips are actually implemented in a safer and more stable way now
• there will be fewer undesired interface actions (visiting profiles, removing users)
• the calling mechanisms should be more stable than the current ones, although not perfect
• changed as little backend functionality as possible for the former context menu actions
• overflow from long names is also handled better than it was previously
• the potentially-too-big 50px avatars are handled by CSS
• the chat adjustments have corresponding tests backing them

Overall, I'm sure I missed something, but we probably won't find out what exactly until this is merged and used by others with real (read: bad old) data :)

Links to related issues

Closes #104 (closed) (problem with removing store managers from team without demoting them first)
Closes #820 (closed) by displaying the same date for both jumpers and regular members.
We should check database-side if we can fix #407 (closed) while at it.
Calling relies on data quality, so #600 (closed) should be looked at too.

How to test

1. View store page as regular store team member
2. View store page as store manager (or ambassador / orga)

and for the list of team members...

• check data accuracy
• check data presentation
• check tooltips
• check differences on mobile
• check the former context menu actions
• tab through the action ;-)

Screenshots (if applicable)

Previous layouts in this branch, for reference:

Checklist

• context menus need to give dynamic feedback when switching between team states, or removing team members
• the default profile photo should be reset ;-)
• clarify whether "last pickup date" is public information or store-manager only
• look into verified data and display something if not verified
• added some tests for callable phone numbers
• more stable callable-phone-number handling for tel:
  https://tools.ietf.org/html/rfc3966#page-6
• try to fix Firefox focus/blur event handling when toggling details
• mobile collapse
• follow-up: look into promoting/demoting as member action
• follow-up: better communicate avatar as profile link, remove "profile" member action
• follow-up: dynamic sorting modes based on certain properties
• follow-up: look into "manage team" toggle mode that could replace the current "Team bearbeiten" screen => highlight folks with SM quiz, only offer team-removal / promotion,demotion actions there, introduce search box for adding new people, etc
• no unrelated changes
• asked someone for a code review
• joined #foodsharing-beta channel at https://slackin.yunity.org
• added an entry to CHANGELOG.md (description, merge request link, username(s))
• Once your MR has been merged, you are responsible to update the #foodsharing-beta Slack channel about what has been changed here. They will test your work in different browsers, roles or other settings