title: Update translation for iOS internationalization
body: <p>To extract the string "marked" with <code>NSLocalizedString</code> in my iOS app, I use the following terminal command:</p>
  
  <pre><code>find . -name \*.m | xargs genstrings -o ro.lproj
  </code></pre>
  
  <p>This will basically extract all the marked strings in all the .m files and put them in the Localizable.strings file inside my project romanian's folder.</p>
  
  <p>My problem is that I don't manage to get it to update the strings file. If I change/add some strings it will overwrite my old strings file.</p>
  
  <p>I've look to the arguments the <code>genstrings</code> accepts, looked on the man page, and I don't seem to find the option to update the file instead of overwriting it.</p>
  
  <p>How do I update the translation file ? </p>