mkdb: escape quotes in condition attributes

Fixes the use of "" in the text of deprecation description. Add a test.
Updated German help translation
Added Brazilian Portuguese translation for help files
Depink the navigation bar

https://bugzilla.gnome.org/show_bug.cgi?id=696570
Use symbolic icons for the navigation links

https://bugzilla.gnome.org/show_bug.cgi?id=696570
Improve the design of the navigation bar

Put the shortcuts on the left, buttons at the right, and insert placeholder icons
instead of hiding the links when necessary.

Move the book title into the page title.

https://bugzilla.gnome.org/show_bug.cgi?id=696570
Make top actually go to the top of the section

https://bugzilla.gnome.org/show_bug.cgi?id=696570
Don't use italics for parameters

The default appearance of <em> is italics and that is
distracting and harder to read while offering no advantages.

https://bugzilla.gnome.org/show_bug.cgi?id=696570
Add more whitespace to some blocks

This adds some "air" to make the pages more readable.

https://bugzilla.gnome.org/show_bug.cgi?id=696570
Add a little space in the table of contents lists

https://bugzilla.gnome.org/show_bug.cgi?id=696570
Decrease the title font size a bit

200% is way too huge

https://bugzilla.gnome.org/show_bug.cgi?id=696570
Use cantarell by default

https://bugzilla.gnome.org/show_bug.cgi?id=696570
Don't hardcode style in the markup

Let CSS handle it all.

https://bugzilla.gnome.org/show_bug.cgi?id=696570
Lighten hard rules a bit

https://bugzilla.gnome.org/show_bug.cgi?id=696570