added file extension .pdf in isthesis.cls document for the three logos in folder assets (e.g. assets/faculty-de -> assets/faculty-de.pdf) and added a bounding box for figure 01 in body01.tex, line 72 so that the document compiles when using
pdflatex (not only
pdflatex) without errors.
The output pdf looks the same as the currently uploaded version.
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