If you translate the pop up box, with bullet points so somebody can read it against the image, you might be in with a chance.
Otherwise, if you've not got much data at risk ... any dates should be stored on the cards, not in the powerup ... you could unload the app, and try using Big Picture, its a gantt chart powerup, free if your board is in a group (doesnt need members, just needs to identify it as a group board).
Make a copy of the board in your workspace thought, use the DUPLICATE BOARD function, and name it BAK COPY & DATE-TIME so you know.
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