About [[Blockly:Puzzle-5510964942765371547-Puzzle.helpImage/en]]
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This message should possibly be ignored, at least for time being and if it is true that we have accidental translations. Of course, they may be not accidental at all. :-)
Yes. I am trying to figure out how to mark it optional.
@Espertus: It's explained at mw:Help:Extension:Translate/Group_configuration#TAGS.