Updated to U.S. spelling.
gui2/taddon_description: Allow the URL textbox to become wider as needed
Replace double space following stops in the Khalifate descriptions with single space
Fix obvious typos in the Khalifate units' descriptions
Add more general Khalifate spelling exceptions for wmllint
Add wmllint spelling exception for 'scrollwork'
Add wmllint spelling exception for 'naptha'
pot-update and regenerated doc files

preparing for 1.11.8
bumped version to 1.11.8
a senseless test commit