This funky line wrapping is actually not a YAML syntax error:
$ ruby -ryaml -rpp -e 'x = YAML.load(File.read("config/wiki_pages.yml")); pp x'|grep -B1 'Isle of'
"source=Isle_of_Man_Government_aerial_imagery_(2001)"=>
"Tag:source=Isle of Man Government aerial imagery (2001)",
--
"source=Isle_of_Man_Government_1:25000_map_(2007)"=>
"Tag:source=Isle of Man Government 1:25000 map (2007)",
Abandon all hope ye who use YAML.
shop=systembolaget: Tag:shop=systembolaget
shop=toys: Tag:shop=toys
shop=travel_agency: Tag:shop=travel agency
+ shop=variety_store: Tag:shop=variety store
shop=video: Tag:shop=video
source:ele=barometric: Tag:source:ele=barometric
source=GURS: Tag:source=GURS
source=IBGE: Tag:source=IBGE
+ source=Isle_of_Man_Government_1:25000_map_(2007): Tag:source=Isle of Man Government
+ 1:25000 map (2007)
+ source=Isle_of_Man_Government_aerial_imagery_(2001): Tag:source=Isle of Man Government
+ aerial imagery (2001)
sport=9pin: Tag:sport=9pin
sport=australian_football: Tag:sport=australian football
sport=boules: Tag:sport=boules