Make "Clean" and "Build" translated in "Add %1 Step"

Do the same as in case of "Deploy" string: after
restoring overwrite it with proper translated string.
Side note: tr("Build") and tr("Clean") have already
been used inside buildconfiguration.cpp so it will
not produce a new record in .ts file, i.e. this
change is not introducing a new message in string freeze
period.

Task-number: QTCREATORBUG-6595
Change-Id: I05040bba5066cbe0b55085cb2acbe43df34becd7
Reviewed-by: Daniel Teske <daniel.teske@nokia.com>

src/plugins/projectexplorer/buildconfiguration.cpp

@@ -187,6 +187,10 @@ bool BuildConfiguration::fromMap(const QVariantMap &map)
             delete list;
             return false;
         }
+        if (list->id() == QLatin1String(Constants::BUILDSTEPS_BUILD))
+            list->setDefaultDisplayName(tr("Build"));
+        else if (list->id() == QLatin1String(Constants::BUILDSTEPS_CLEAN))
+            list->setDefaultDisplayName(tr("Clean"));
         m_stepLists.append(list);
     }