Use msg references in block JSON for text_charat (#1426)
Use msg references in block JSON for text_charat (#1426)


nickmain/blockly,jstnhuang/blockly,trodi/blockly,google/blockly,nickmain/blockly,nickmain/blockly,trodi/blockly,joshlory/blockly,trodi/blockly,rachel-fenichel/blockly,nickmain/blockly,twodee/blockly,rachel-fenichel/blockly,twodee/blockly,picklesrus/blockly,rachel-fenichel/blockly,mark-friedman/blockly,nickmain/blockly,trodi/blockly,mark-friedman/blockly,google/blockly,twodee/blockly,mark-friedman/blockly,mark-friedman/blockly,joshlory/blockly,nickmain/blockly,mark-friedman/blockly,rachel-fenichel/blockly,groklearning/blockly,rachel-fenichel/blockly,rachel-fenichel/blockly,mark-friedman/blockly,jstnhuang/blockly,groklearning/blockly,picklesrus/blockly,google/blockly,google/blockly,jstnhuang/blockly,groklearning/blockly,rachel-fenichel/blockly,twodee/blockly,trinketapp/blockly,picklesrus/blockly,trinketapp/blockly,google/blockly,twodee/blockly,jstnhuang/blockly,twodee/blockly,trinketapp/blockly,google/blockly,groklearning/blockly,joshlory/blockly,google/blockly,trinketapp/blockly