Fix localized overview placeholder thumbnail

Merged Job Doesburg requested to merge localize-committee-and-board-placeholder-images into master

Previous behaviour

Steps to reproduce:

  1. Check the thumbnails of committees/boards/societies without images
  2. They're not working

New behaviour

Steps to validate that it works:

  1. Check the thumbnails of committees/boards/societies without images
  2. They're working
Edited by Sébastiaan Versteeg

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