Add new mealUsage type: Dessert #223

[wp99cp]

Add "Dessert" prior to "Leitersnack" everywhere.

Thanks @maede97

[github-actions]

• Version changed since last release! Version of this release: 1.14.15 (patch).

[github-actions]

Todos before releasing a new version

• Check release notes: All new features/changes included? Date correct?
• Check help-page messages: Are they all up to date? Update screenshots. Is the date correct?
• Check preview build and test it with the productive database.
• Deploy new revision of the PDF-Export Service

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Visit the preview URL for this PR (updated for commit 8c7aa1b):

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[github-actions]

• Version changed since last release! Version of this release: 1.15.1 (patch).

[github-actions]

Todos before releasing a new version

• Check release notes: All new features/changes included? Date correct?
• Check help-page messages: Are they all up to date? Update screenshots. Is the date correct?
• Check preview build and test it with the productive database.
• Deploy new revision of the PDF-Export Service