Fix: Show missing icons

[fsbraun]

Description

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[bot]]

Codecov Report

Patch coverage: 25.00% and project coverage change: -0.05% :warning:

Comparison is base (1e72f27) 33.28% compared to head (566c40e) 33.24%. Report is 1 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #49 +/- ## ========================================== - Coverage 33.28% 33.24% -0.05% ========================================== Files 17 17 Lines 727 728 +1 Branches 71 71 ========================================== Hits 242 242 - Misses 484 485 +1 Partials 1 1 ``` | [Files Changed](https://app.codecov.io/gh/django-cms/djangocms-history/pull/49?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=django-cms) | Coverage Δ | | |---|---|---| | [djangocms\_history/cms\_toolbars.py](https://app.codecov.io/gh/django-cms/djangocms-history/pull/49?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=django-cms#diff-ZGphbmdvY21zX2hpc3RvcnkvY21zX3Rvb2xiYXJzLnB5) | `0.00% <0.00%> (ø)` | | | [djangocms\_history/\_\_init\_\_.py](https://app.codecov.io/gh/django-cms/djangocms-history/pull/49?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=django-cms#diff-ZGphbmdvY21zX2hpc3RvcnkvX19pbml0X18ucHk=) | `100.00% <100.00%> (ø)` | |

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