title: Avoid Android Lint complains about not-translated string
body: <p>is it possible to specify that the strings in a file within the <code>value-*</code> directories are purposely not translated into other languages? I have a bunch of strings that are common for all the languages and need no translation, so I've created an <code>unlocalized-strings.xml</code> file within <code>values</code> directory.. Running Android Lint to check for problems it keeps saying that some translations are missing.. I do not want to disable this check on the whole project, I'd like to disable it only in some XML files.. is it possible? </p>
  
  <pre class="lang-none prettyprint-override"><code>"title_widget_updater_service" is not translated in de, en, en-rUS, it
  
  Issue: Checks for incomplete translations where not all strings are translated
  Id: MissingTranslation
  
  If an application has more than one locale, then all the strings declared in one language     
  should also be translated in all other languages.
  
  By default this detector allows regions of a language to just provide a subset of the 
  strings and fall back to the standard language strings. You can require all regions to 
  provide a full translation by setting the environment variable 
  ANDROID_LINT_COMPLETE_REGIONS.
  </code></pre>
  
  <p>How can defined this <em>region</em> of <em>unlocalized</em> strings?</p>