Correct formatting of bibtex (line breaks, alignment, etc.) shown when clicking on the bib icon of a paper

[s-steinhorst]

Due to the integration into the TUM Typo3 website, we can no longer create the popups used in the original script (see here: https://github.com/vkaravir/bib-publication-list). Hence, in a quick and dirty fix, a new browser tab is shown to present a paper's bibtex entry. However, the formatting is ugly and needs to be polished with, e.g., line breaks, ensuring alignment, spacing, etc. The possible constraints imposed by presenting the publications list within an iFrame on the ESI Typo3 website have to be considered.