In the GWT editor, when someone else saves a translation for the text flow that a translator is editing, the translator is shown a dialog that allows them to choose whether to discard what they have typed, or continue working on it.

The purposes are to ensure that a translator does not accidentally overwrite someone else's recent translation, and to make sure translators do not lose their work-in-progress when someone else saves.

This functionality or similar functionality that serves the same purposes should be added to the Angular editor.