This is not a spelling mistake. The word "check" has the equivalent meaning in American English as "cheque" in British English. In the US context, cheque is rarely if ever used when talking about the same physical document.

Also the provenance of cheque comes from French.

Historical background: https://en.m.wikipedia.org/wiki/Cheque

Solution: All Odoo databases allow anyone to load any translation, at any time. In this case, if you are in the UK environment and would like to use the word cheque, go to your main DB dashboard, click on the "green gear wheel"  SETTINGS and from there follow these visual steps: https://www.screencast.com/t/zfoffx90Hf8n

I hope this helps and thanks for commenting.