RCP: 0.7.9, EN welcome page not loaded if Windows OS language is Italian

On first launch on an Italian Windows 10, the welcome page opening produces the following stacktrace:

Starting up 0.7.9 (2018-01-09 10:36)...
java.io.FileNotFoundException: http://textometrie.ens-lyon.fr/html/welcome/0.7.9/it/welcome.html
    at sun.net.www.protocol.httHttpURLConnection.getInputStream(HttpURLConnection.java:1625)
    at java.net.URL.openStream(URL.java:1037)
    at org.txm.rcpapplication.commands.OpenWelcomePage.openWelcomePage(OpenWelcomePage.java:73)
    at org.txm.rcpapplication.ApplicationWorkbenchAdvisor$7.run(ApplicationWorkbenchAdvisor.java:833)
    at org.eclipse.ui.internal.UILockListener.doPendingWork(UILockListener.java:167)
    at org.eclipse.ui.internal.UISynchronizer$3.run(UISynchronizer.java:165)
    at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35)
    at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:136)
    at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:4147)
    at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3764)
...

(from redmine: issue id 2359, created on 2018/03/29 by Serge Heiden)