Increase the size (width) of the dialog popup to have more space

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• identify possibilities to increase the size of the popup dialog
• find a good size

Long-term:

• make width & height configurable

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https://jira.atlassian.com/browse/JRASERVER-67719

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Inspiration?
https://github.com/Catrobat/Timesheet/blob/develop/src/main/resources/import.vm

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Documentation and Solution here:
https://community.atlassian.com/t5/Jira-questions/Displaying-Content-in-a-Dialog-in-JIRA-popup-width/qaq-p/352933

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use full-width-field on textarea and select box instead of long-field