Move comment so the sync_translation script won't copy it to the output

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

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

    <!-- === App-specific strings ============================================================= -->

<!--

     When removing strings from the main file, please cleanup the translations.

         This doesn't work on multiline strings, nor strings with the NEW tag.

         find . -name strings.xml | xargs perl -pi -e's!^\s+<string name="string_name_here".+?</string>\s*\z!!'

     The script tools/sync_translation.py will get rid of any surplus strings.

-->

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

    <!-- === App-specific strings ============================================================= -->

    <!-- This should make it easier for forks to change the branding -->