Avoid Android Lint complains about not-translated string

It's the ignore attribute of the tools namespace in your strings file, as follows:

<?xml version="1.0" encoding="utf-8"?>
<resources
  xmlns:tools="http://schemas.android.com/tools"
  tools:ignore="MissingTranslation" >

  <!-- your strings here; no need now for the translatable attribute -->

</resources>

I don't know how to ignore all the file, but you can do it string by string using:

<string name="hello" translatable="false">hello</string>

Add to build.gradle:

android {
     lintOptions {
        disable 'MissingTranslation'
    }
}