po: Add English (Canada) resource

[Ken Sharp]

Canadian English follows some British/French rules but not others.

I have left some of the -ise/-ize words fuzzy because:

"the etymological convention that verbs derived from Greek roots are 
spelled with -ize and those from Latin with -ise is preserved in that 
practice."
http://en.wikipedia.org/wiki/Canadian_english#Spelling_and_dictionaries

I tried looking for the origins of the words and I couldn't get any. The 
non-fuzzies are correct.

With British, US and Canadian I believe all the English variations (used 
in Wine) are covered, except Philippines (follows US rules).
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