I am trying to find the Localization.js file, but I haven’t have luck.
Could you please point to the location of this file?
I want to change the SearchInputWatermark text.
Sorry for the delay in the answer.
Localization is not yet supported in Org Chart for Office 365. But it will be available after a new release of Org Chart with support for modern SharePoint pages. It will happen in about two-three weeks.