feat(translations): add german language

[Hypnotist1148]

Link to Jira Ticket

https://formio.atlassian.net/browse/FIO-10611

Description

What changed?

This PR adds translations for the german language.

Why have you chosen this solution?

Because it matches the english translations.

Breaking Changes / Backwards Compatibility

This PR should not include breaking changes or impact backwards compatibility.

Dependencies

No dependencies were added.

How has this PR been tested?

I have not added any automated changes as this is only a translation.

Checklist:

• I have completed the above PR template
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation (if applicable)
• My changes generate no new warnings
• My changes include tests that prove my fix is effective (or that my feature works as intended)
• New and existing unit/integration tests pass locally with my changes
• Any dependent changes have corresponding PRs that are listed above

[Hypnotist1148]

We (ÖAMTC) talked with some of your colleagues about implementing german translations in Form.io, thus this PR was created.

[brendanbond]

Hi @Hypnotist1148 thanks so much for the contribution! Unfortunately we've recently made some changes to our branches, which means this pull request is stale and needs to be updated. Would you be willing to update this PR so it can be merged into main?

[Hypnotist1148]

Hi @brendanbond, yes sure, will be on it probably by tomorrow.
I will tag you when I'm done.

[Hypnotist1148]

Hello, @brendanbond, this should be good to go.

[ZenMasterJacob20011]

LGTM

[ZenMasterJacob20011]

Additionally

de: {
      translation: fastCloneDeep(deTranslation)
    }

should be added to src/i18n.js under resources. This allows for the use of the file