Use French when no translation

Good point. However, according to https://stats.wikimedia.org/wikimedia/squids/SquidReportPageViewsPerLanguageBreakdown.htm#Occitan , it seems that the Occitan Wikipedia receives less than 6 % of visits from Catalonia/Spain. About 5 % of edits come from Spain: https://web.archive.org/web/20150426123709/http://stats.wikimedia.org/wikimedia/squids/SquidReportPageEditsPerLanguageBreakdown.htm