Avoid Android Lint complains about not-translated string

Question

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'
    }
}

There are 3 ways that I know of :

To apply the modification value by value : Set the attribute translatable="false" on the <string> definition:

<string name="account_setup_imap" translatable="false">IMAP</string>

If you have a lot of resources that should not be translated, you can place them in a file named donottranslate.xml and lint will consider all of them non-translatable resources.

Another way I discovered while browsing Hackers Keyboard project sources:
You can add the prefix donottranslate- to your resource file. As in the previous example, lint will consider all of them non-translatable resources.
In your case, you can replace unlocalized-strings.xml by donottranslate-strings.xml. It seems to work, but I haven't found any documentation for this tip.

See: Android Tools Project Site: Non-translatable Strings

And here is a Android Studio solution for disabling this fatal Lint error:

I think that what you need instead of disabling lint is to mark them with attribute

translatable="false"