Enable PDF and EPUB build (#272) #561

Job	Run time
sync / sync	4m 23s
check / Build docs (html)	6m 17s
check / Build docs (latex)	6m 42s
check / Lint translations	58s
check / Check for zero-width space characters	26s
check / Build docs (epub)	6m 6s
check / Build docs (pdf)	48m 5s
	1h 12m 57s

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