[Website] The icons in publication don't all have the same size

[Bachibouzouk]

When visiting the publications page, the icon to the left of Frederic's Master thesis is smaller than the other ones. It is probably due to the subtext size which changes the dimension of the rendered div tag

Checklist to make sure that the bug report ist complete:

• Branch: dev, updated on 2021-10-19
• If applicable: Share screenshots/images of your problem