Static resources localization

[3325818089]

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Description

I is China User.
I is use npm get Blocky(^11.2.0).
I found that while using it “trash can” icon source is network（https://blockly-demo.appspot.com/static/media/sprites.png）.
I hope can consider change to local.
so sorry I not very good English.
this is Chinese:
我是中国用户。

我使用的是npm 获取的 Blocky（^11.2.0）。

我发现使用它时“垃圾桶”图标来源是网络(https://blockly-demo.appspot.com/static/media/sprites.png）.

我希望能考虑改到当地。

Reproduction steps

1. Create Blocks

Stack trace

Screenshots

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Browsers

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[gonfunko]

Duplicate of #8714.