UI text: Fix UI text to follow the guidelines

- Fix typos
- Replace "options" with "preferences"
- Fix capitalization
- Remove "please"
- Do not use contractions

Task-number: QTCREATORBUG-28334
Change-Id: Ie029eae435634aa2fb354e173fa107af72f7b025
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

src/libs/utils/terminalprocess.cpp

@@ -397,7 +397,7 @@ void TerminalImpl::start()
     d->m_process.start();
     if (!d->m_process.waitForStarted()) {
         const QString msg = QtcProcess::tr("Cannot start the terminal emulator \"%1\", change the "
-                                           "setting in the Environment options. (%2)")
+                                           "setting in the Environment preferences. (%2)")
                                 .arg(terminal.command).arg(d->m_process.errorString());
         cleanupAfterStartFailure(msg);
         return;