Fix typo in BKY message key (#1616)
Fix typo in BKY message key (#1616)

We had {% instead of %{

Fixes #1613
rachel-fenichel/blockly,nickmain/blockly,rachel-fenichel/blockly,twodee/blockly,mark-friedman/blockly,mark-friedman/blockly,picklesrus/blockly,google/blockly,rachel-fenichel/blockly,twodee/blockly,jstnhuang/blockly,google/blockly,joshlory/blockly,jstnhuang/blockly,trinketapp/blockly,twodee/blockly,nickmain/blockly,picklesrus/blockly,trinketapp/blockly,joshlory/blockly,google/blockly,nickmain/blockly,trinketapp/blockly,mark-friedman/blockly,trinketapp/blockly,rachel-fenichel/blockly,mark-friedman/blockly,mark-friedman/blockly,picklesrus/blockly,joshlory/blockly,nickmain/blockly,rachel-fenichel/blockly,jstnhuang/blockly,rachel-fenichel/blockly,mark-friedman/blockly,twodee/blockly,google/blockly,google/blockly,jstnhuang/blockly,nickmain/blockly,rachel-fenichel/blockly,google/blockly,twodee/blockly,google/blockly,nickmain/blockly,twodee/blockly