fix: German translation for seats_availability text

[ajayjha1]

Fixes incorrect German translation for seat availability text.

Issue

When setting a seat limitation to 1, it showed "1 seats_available" instead of "1 Platz verfügbar".
When changing to 2 seats, it showed "2 plätze verfügbare" instead of "2 Plätze verfügbar".

Fix

Added proper German singular/plural translations with correct grammar:

• seats_available_one: "Platz verfügbar"
• seats_available_other: "Plätze verfügbar"

This ensures the count is displayed with the correct grammatical form in German.

##For 1 needs to be fixed for other languages too currently shows "1 seats_available" instead of "1 Available"
Fixes #20016

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[github-actions]

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Details:

Unknown release type "Fix" found in pull request title "Fix: German translation for seats_availability text". 

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[graphite-app]

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[CLAassistant]

All committers have signed the CLA.

Minor change to add

[github-actions]

E2E results are ready!

• Workflow #52418.1 latest results

[ajayjha1]

@TusharBhatt1 "seats_available_one": "Platz verfügbar" missed in German translation file.

[TusharBhatt1]

@TusharBhatt1 "seats_available_one": "Platz verfügbar" missed in German translation file.

It was missing throughout all languages