translations for "List of pages" and "Table of contents" using px:i18n-translate
added common-utils import to epub3-nav-create-page-list.xpl
epub3-nav-utils: better language determination

depends on daisy/pipeline-modules-common#59
epub3-nav-utils: fixed regex escaping title and updated catalog
Merge pull request #37 from daisy/epub3-nav-utils-i18n

translations for "List of pages" and "Table of contents" using px:i18n-translate