Add following at the header of your strings.xml file
<resources
xmlns:tools="http://schemas.android.com/tools"
tools:locale="en" tools:ignore="MissingTranslation">
or:
In "Window" > "Preferences" > "Android" > "Lint Error Checking":
(For Mac, "Eclipse" > "Preferences" > "Android" > "Lint Error Checking")
Find the MissingTranslation line, and set it to Warning as seen below:
