DocumentsUI: Workaround for aapt warnings

<?xml version="1.0" encoding="utf-8"?>

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     Copyright (C) 2014 The CyanogenMod Project

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<resources xmlns:xliff="urn:oasis:names:tc:xliff:document:1.2">

    <!-- Do not translate - Dummy strings to prevent aapt warnings -->

    <string name="loading"></string>

    <string name="more"></string>

</resources>