I spent 3 years trying to get my computer to stop AmericaniZing everything. It nearly drove me crazy, but today I found a way to get it to UK English and thought I'd share it with everyone to save you the suffering! This works for my MacbookPro on OS X Leopard. Should work for everyone with this OS in the least. 
Do the following:
1) Go to TextEdit->Spelling & Grammar -> Show Spelling and Grammar - > Scroll to British English in the option at the bottom. Then close it!
You can check it in MS Word and mail and it should be fine.
2) Go to System Preferences -> International->Language tab (should be on this by default) ->Edit List-> Tick the British English option -> Click OK. Then move British English to the top of the list on the left and remove the normal "English" option to be safe.
It will prompt you to log out and in again.
You are done!
Congratulations on converting to PROPER English, not this American crap with 'color' and 'americanize' and 'realize' and all the other crap spellings they have over the pond that drive us Brits ape ****, haha!
If anyone has any tips on how to add a 'British English Dictionary' instead of the default 'American Dictionary' in the application folder, please share your tips here.
Original source of tips: https://forums.macrumors.com/threads/569225/
Do the following:
1) Go to TextEdit->Spelling & Grammar -> Show Spelling and Grammar - > Scroll to British English in the option at the bottom. Then close it!
You can check it in MS Word and mail and it should be fine.
2) Go to System Preferences -> International->Language tab (should be on this by default) ->Edit List-> Tick the British English option -> Click OK. Then move British English to the top of the list on the left and remove the normal "English" option to be safe.
It will prompt you to log out and in again.
You are done!
Congratulations on converting to PROPER English, not this American crap with 'color' and 'americanize' and 'realize' and all the other crap spellings they have over the pond that drive us Brits ape ****, haha!
If anyone has any tips on how to add a 'British English Dictionary' instead of the default 'American Dictionary' in the application folder, please share your tips here.
Original source of tips: https://forums.macrumors.com/threads/569225/
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