As an editor with a German locale I expect the label to stay upper case

**Describe the bug**

`label` and `label_singular` are transformed to lower case when they are upper case by intention in the `config.yml`. This is at least true for the German locale.

**To Reproduce**

Write `label: Autor` in the `config.yml`

**Expected behavior**

I expect the label of the field or panel to be "Autor"

**Screenshots**


**Applicable Versions:**

- Netlify CMS version: 2.10.50
- Git provider: GitLab
- OS: Manjaro Linux
- Browser version: Chromium 83.0.4103.61

**CMS configuration**

```yaml
- label: "Metadaten des Artikels"
name: "article"
file: "content/de/metadata/article-metadata.inc.yml"
fields:
- { label: Titel, name: title, widget: string }
- label: Autor_innen
label_singular: Autor_in
name: author
[...]
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