[Fixes #207] Task: when uploading metadata from ORD received an error that abstract field only allows 2000 chars

[mwallschlaeger]

Description

Extend field length of the folowing fields:

• title: 255 -> 512
• title_translated: 255 -> 512
• abstract: 2000 -> 6000
• abstract_translated: 2000 -> 6000
• purpose: 500 -> 1024
• subtitle: 400 -> 1024

Type of Change

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• Bug fix
• New feature
• Documentation update
• Refactoring
• Other (please describe)

Related Issue

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closes #207

Checklist

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• The feature or bug fix has been discussed and documented in an issue beforehand.

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