LP1309131 - Fix series link

Clicking on a series link with a hyphen failed because the hyphen was
stripped and the two words are joined together. This branch changes
series.tts to replace special characters with a space, which is similar to
the links we build for authors.

Signed-off-by: Kathy Lussier <klussier@masslnc.org>
Signed-off-by: Ben Shum <bshum@biblio.org>