Leading to the following Definitions app problem:

app: contentTranslationSupport
from jcr
at /modules/content-translation-support/apps/contentTranslationSupport
Source data processing problem: Property [path] not found in class [info.magnolia.ui.vaadin.integration.contentconnector.ConfiguredJcrContentConnectorDefinition], property is not assigned: /subApps/browser/contentConnector

See: /modules/content-translation-support/apps/contentTranslationSupport/subApps/browser/contentConnector@path

Most likely this is supposed to be the rootPath property of info.magnolia.ui.vaadin.integration.contentconnector.ConfiguredJcrContentConnectorDefinition therefore should be renamed accordingly. As the property already defaults to / (slash aka root node) (see info.magnolia.ui.vaadin.integration.contentconnector.ConfiguredJcrContentConnectorDefinition#rootPath) and this is the value of underlying configuration, we can also safely get rid of it.

Additionally, there is an unknown preview property on a BasicUploadFieldDefinition.
See: /modules/content-translation-support/dialogs/uploadTranslationFile/form/tabs/upload/fields/name@preview

dialog:content-translation-support:uploadTranslationFile
(from jcr /modules/content-translation-support/dialogs/uploadTranslationFile)

Source data processing problem
Property [preview] not found in class [info.magnolia.ui.form.field.definition.BasicUploadFieldDefinition], property is not assigned
/form/tabs/upload/fields/name