Don't shout in text messages

Change-Id: Ie8d2c6761c87b358f0bc8691e529ba8144e267a4
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@qt.io>

src/plugins/qbsprojectmanager/qbsproject.cpp

@@ -252,7 +252,7 @@ bool QbsProject::ensureWriteableQbsFile(const QString &file)
             bool makeWritable = QFile::setPermissions(file, fi.permissions() | QFile::WriteUser);
             if (!makeWritable) {
                 QMessageBox::warning(ICore::mainWindow(),
-                                     tr("Failed!"),
+                                     tr("Failed"),
                                      tr("Could not write project file %1.").arg(file));
                 return false;
             }