Consider using British spelling

[maneesha]

The Carpentries style guide recommends using British spellings. Consider using organise/organisation instead of organize/organization.

[mchiapello]

The word "organize" is present a total of 5 times in all the lessons:

00-intro.md:1
01-format-data.md:2
02-common-mistakes.md:2
03-dates-as-data.md:0
04-quality-control.md:0
05-exporting-data.md:0
06-data-formats-caveats.md:0

The word "organization" is present a total of 8 times in all the lessons:

00-intro.md:5
01-format-data.md:3
02-common-mistakes.md:0
03-dates-as-data.md:0
04-quality-control.md:0
05-exporting-data.md:0
06-data-formats-caveats.md:0

Changing them should not be a big deal.