Overlapping titles on main page for PDFs

[jfaltenbacher]

Problem Description
Titles are overlapping for PDF version some languages and books.

Affected SLE HA guides:
zh-tw admin guide
ja-jp, zh-tw geo clustering quick start

see also SUSE/doc-sleha#342
and https://jira.suse.com/browse/DOCTEAM-1080

Expected Behaviour
Have enough space for the title, especially for long Product names

[tomschr]

I've reduced the font size and change bold to regular for Japanese and Chinese. This is the result:

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[tomschr]

For the time being, I consider it as enough so merging it. If you still encounter issues, just reopen it (or create a new issue).

[jfaltenbacher]

Great thank you.