fix: use dataset title as resource title only as fallback
fix: use dataset title as resource title only as fallback

The resource title should be derived from the resource name
if it exists. The dataset title is used as a fallback only
if the resource title can not be found.

For the english version of the resource title remove 'Preview'
in case it is double

Co-authored-by: Nataliia Kovalchuk <c5a1685f2ff89d8ec10be09ee8f3f9e4da3da063@liip.ch>

opendata-swiss/ckanext-geocat,ogdch/ckanext-geocat,ogdch/ckanext-geocat,opendata-swiss/ckanext-geocat