Standardize spelling: organization

Problem/Motivation

The British spelling "organisation" is used instead of the American spelling "organization".
Typo was introduced by: https://www.drupal.org/project/social/issues/3518563 ✨ User affiliation feature Needs work

Steps to reproduce

- [ ] As admin, go to /admin/config/people/social-profile and enable affiliations on platform.
- [ ] Go to any user profile and edit it
- [ ] In affiliation section, make sure that word "organization" is used instead of "organisation".

Proposed resolution

Replaced all instances of the British spelling "organisation" with the American spelling "organization" for consistency across the codebase related to affiliations.

Remaining tasks

N/A

User interface changes

N/A

API changes

N/A

Data model changes

N/A