Change "Create new..." to "Create new"

Consistency fix in welcome screen button string: all other buttons don't
use ellipsis, the "Create new" one shouldn't either. The ellipsis would
be appropriate on a menu item, but not on an action button.

src/welcomescreen.cpp

@@ -285,7 +285,7 @@ WelcomeWindow::WelcomeWindow()
 
     leftsizer->Add(new ActionButton(
                        this, XRCID("menu_new_from_pot"), "CreateTranslation",
-                       _(L"Create new…"),
+                       _("Create new"),
                        _("Create new translation from POT template.")),
                wxSizerFlags().Border(wxTOP, PX(2)).Expand());