Fix typos en: Check-In (closes #3132) (COMMUNITY) (#3133)

* fix Ok and Check-In

* change OK back to Ok and Okay will become just Ok

* remove capitalization

* consistent and correct using of Check-in

* revert changes in values-de

Co-authored-by: Mohamed <mohamed.metwalli@sap.com>
Co-authored-by: Matthias Urhahn <matthias.urhahn@sap.com>