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The first gotcha is that you can't import an existing project, you will need to create a new one and copy your sources into the folder where you created your IntelliJ FlexJS project, here I chose a Web Application for this example but you can also choose a Web / Desktop / Mobile + Apllication / Library depending on what you are targeting.

(You should have at least one Flex SDK installed and configured in IntelliJ to do that)

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5- Click on Module Defaults (If you have more than one module, it makes sense you apply this and the following to Project Default instead).

6- Remove the default en_US local

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