I've not found a setting to allow me to set a preference of "Synchronise" in place of "Synchronize" for the text shown adjacent to vCard and iCalendar fields.
Should this text be configurable to allow it to follow the national language of the Field-Level Help on the page?
Check out the documentation on supporting other languages in private cloud
You can change following keys for existing language files in your private cloud if you wish to customize the "Synchronize" text
Synchronize = Synchronize
newui.eu.Synchronize = Synchronize