fix: Use gettext_lazy for model verbose names

[tidenhub]

Hi,
model field verbose_names should use gettext_lazy, because it creates migrations based on user language settings.

manage.py makemigrations --dry-run
Migrations for 'djangocms_frontend':
  /home/x/lib/python3.9/site-packages/djangocms_frontend/migrations/0002_alter_frontenduiitem_options.py
    - Change Meta options on frontenduiitem
Migrations for 'listgroup':
  /home/x/lib/python3.9/site-packages/djangocms_frontend/contrib/listgroup/migrations/0002_alter_listgroup_options_alter_listgroupitem_options.py
    - Change Meta options on listgroup
    - Change Meta options on listgroupitem
Migrations for 'media':
  /home/x/lib/python3.9/site-packages/djangocms_frontend/contrib/media/migrations/0002_alter_media_options_alter_mediabody_options.py
    - Change Meta options on media
    - Change Meta options on mediabody
Migrations for 'tabs':
  /home/x/lib/python3.9/site-packages/djangocms_frontend/contrib/tabs/migrations/0002_alter_tab_options_alter_tabitem_options.py
    - Change Meta options on tab
    - Change Meta options on tabitem
Migrations for 'utilities':
  /home/x/lib/python3.9/site-packages/djangocms_frontend/contrib/utilities/migrations/0002_alter_heading_options_alter_spacing_options_and_more.py
    - Change Meta options on heading
    - Change Meta options on spacing
    - Change Meta options on tableofcontents

[fsbraun]

Well spotted! Thank you!

[fsbraun]

@tidenhub Can you fix the isort issue?

[tidenhub]

pre-commit.ci autofix

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.91%. Comparing base (f11feee) to head (b7527d6).
Report is 13 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #203      +/-   ##
==========================================
- Coverage   86.93%   86.91%   -0.02%     
==========================================
  Files         120      120              
  Lines        3107     3119      +12     
  Branches      330      331       +1     
==========================================
+ Hits         2701     2711      +10     
+ Misses        304      303       -1     
- Partials      102      105       +3     

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