Part: Attempt to translate exceptions in dialogs

Relies on the exception text having been added to the translation database in a previous call to QT_TRANSLATE_NOOP, and put in the 'Exception' context.

src/Mod/Part/Gui/TaskLoft.cpp

@@ -212,7 +212,7 @@ bool LoftWidget::accept()
         doc->commitCommand();
     }
     catch (const Base::Exception& e) {
-        QMessageBox::warning(this, tr("Input error"), QString::fromLatin1(e.what()));
+        QMessageBox::warning(this, tr("Input error"), QCoreApplication::translate("Exception", e.what()));
         return false;
     }