17/8/20: English copy typo

[warpling]

Describe the bug, issue or concern

There is a typo in the English screenshots of the app: 'a' should probably be "someone" or "a high risk contact", etc. (If there's a better place for this kind of feedback please let me know!)

Screenshots

Governance

• [x] I've read the contributing document https://github.com/minvws/.github/blob/master/CONTRIBUTING.md
• [x] I've read and understand the Code of Conduct https://github.com/minvws/.github/blob/master/CODE_OF_CONDUCT.md
• [x] I understand that any contributions or suggestions I made may make it into the actual code. I've read the License https://github.com/minvws/nl-covid19-notification-app-coordination/blob/master/LICENSE.txt and the contributor license agreement https://github.com/minvws/nl-covid19-notification-app-coordination/blob/master/CLA.md