In some language, the width of the blockly block canvas is not enough, so can't see characters on blocks

[setoyama60jp]

Expected Behavior

In any language, we should be able to see characters on blockly block canvas.

The width should have a little wider value than current fixed value 250px or change depending on the content width of blockly block canvas.

Actual Behavior

In some language, for example "にほんご" ,

users can't see characters on blocks because the width of blockly block canvas (which has "blocklyBlockCanvas" class, a svg element) is not enough.
(Now the width seems to have a fixed value of 250px)

Steps to Reproduce

1. set the language "にほんご"

2. select the "Motion" blocks in "にほんご" language.

Operating System and Browser

Mac OS 10.14.3 Chrome 73.0.3683.86