ci: Prepare release 3.0.0rc3

[fsbraun]

Description

• Fix folder widget
• Fix breadcrumbs
• Updated locales

Related resources

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Checklist

• I have opened this pull request against master
• I have added or modified the tests when changing logic
• I have followed the conventional commits guidelines to add meaningful information into the changelog
• 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]

Codecov Report

Merging #1372 (ef8f157) into master (4733fd4) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #1372   +/-   ##
=======================================
  Coverage   73.66%   73.66%           
=======================================
  Files          75       75           
  Lines        3410     3410           
  Branches      551      551           
=======================================
  Hits         2512     2512           
  Misses        727      727           
  Partials      171      171           

Impacted Files	Coverage Δ
filer/validation.py	81.08% <ø> (ø)
filer/__init__.py	100.00% <100.00%> (ø)