Enable PDF and EPUB build #203

Job	Run time
sync / sync	4m 20s
check / Build docs (epub)	6m 50s
check / Lint translations	52s
check / Build docs (latex)	7m 8s
check / Check for zero-width space characters	8s
check / Build docs (html)	7m 6s
check / Build docs (pdf)	13m 27s
	39m 51s

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