Added localization file nl-nl

[sandervanlaar]

Describe your changes:

Fixes n/a
Added a localization file for the Dutch language (nl-nl). The company I work for is a Dutch-spoken organization, so there was a need for Dutch labels, messages, etcetera. I translated all values in the JSON file.

Type of change:

• Bug fix
• Improvement
• New feature
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation

Checklist:

• I have read the CONTRIBUTING document.
• My PR title is Fixes <issue-number>: <short explanation>
• I have commented on my code, particularly in hard-to-understand areas.
• For JSON Schema changes: I updated the migration scripts or explained why it is not needed.

New feature

• The issue properly describes why the new feature is needed, what's the goal, and how we are building it. Any discussion
  or decision-making process is reflected in the issue.
• I have updated the documentation.
• I have added tests around the new logic.

[github-actions]

Hi there 👋 Thanks for your contribution!

The OpenMetadata team will review the PR shortly! Once it has been labeled as safe to test, the CI workflows
will start executing and we'll be able to make sure everything is working as expected.

Let us know if you need any help!

[github-actions]

Jest test Coverage

UI tests summary

Lines	Statements	Branches	Functions
	51.52% (25837/50148)	33.75% (10165/30120)	32.51% (2969/9132)

[sonarcloud]

Quality Gate passed for 'open-metadata-ui'

Kudos, no new issues were introduced!

0 New issues
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud

[harshach]

hi @sandervanlaar thanks for the PR. We will review and merge it in

[harshach]

Thanks @sandervanlaar for the awesome contribution!!