zhaoyongjie opened a new pull request #10902:
URL: https://github.com/apache/incubator-superset/pull/10902
### SUMMARY
babel script broken by format string, runing after translation script
```
flask fab babel-extract --target superset/translations --output
superset/translations/messages.pot --config superset/translations/babel.cfg -k
_ -k __ -k t -k tn -k tct
```
raise bable exception
<img width="1218" alt="image"
src="https://user-images.githubusercontent.com/2016594/93290141-a506af80-f812-11ea-97bd-0c8c24308a9e.png";>
### TEST PLAN
Do we need a tox task to add the translation testing? @mistercrunch
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