I just discovered that the query widget is not recognizing the Hebrew text in my layers.
I tried it in the WAB (Web App Builder) and also in the Operations Dashboard.
do you have any idea what should I do to make the wigdet work in Hebrew?
Have you tried in WAB Release Candidate 1 (only available on ArcGIS Online)? Have you submitted a bug on the Beta site for this? Until the application is fully released you can expect some language issues like this.