This has been discussed on the mother meta before.

The bottom line then, was:

• posters are free to write in their own dialect of English
• but tagging should be in American English.

The British-spelt tags can be made synonyms of the American-spelt tags

This has been discussed on the mother meta before.

The bottom line then, was:

• posters are free to write in their own dialect of English
• but tagging should be in American English.

The British-spelt tags can be made synonyms of the American-spelt tags