Fix: str(obj) must not return a lazy object

[fsbraun]

Description

This fixes two bugs in the permission object:

• an error if "all folders" is selected for a permission object.
• incorrectly sized select2 widget in the permission admin
• 4 strings were not sent to gettext and therefore not part of the locales.

Thanks to @prepstarr for pointing out those issues in #1404 and on slack.

Related resources

• 1404

• ...

Checklist

• [x] I have opened this pull request against master
• [ ] I have added or modified the tests when changing logic
• [x] I have followed the conventional commits guidelines to add meaningful information into the changelog
• [x] I have read the contribution guidelines and I have joined #workgroup-pr-review on Slack to find a “pr review buddy” who is going to review my pull request.

[codecov[bot]]

Codecov Report

Merging #1405 (b3e4347) into master (7315e2b) will increase coverage by 0.02%. The diff coverage is 55.55%.

@@            Coverage Diff             @@
##           master    #1405      +/-   ##
==========================================
+ Coverage   74.81%   74.84%   +0.02%     
==========================================
  Files          75       75              
  Lines        3446     3450       +4     
  Branches      554      554              
==========================================
+ Hits         2578     2582       +4     
  Misses        698      698              
  Partials      170      170              

Files Changed	Coverage Δ
filer/models/foldermodels.py	88.44% <33.33%> (+0.05%)	:arrow_up:
filer/admin/fileadmin.py	94.50% <100.00%> (+0.18%)	:arrow_up: