Updates saving passwords warning messages (#4052)

to suggest using a authentication method

Author: SrNetoChan

src/gui/qgsnewhttpconnection.cpp

@@ -216,7 +216,7 @@ void QgsNewHttpConnection::accept()
   if ( !txtPassword->text().isEmpty() &&
        QMessageBox::question( this,
                               tr( "Saving passwords" ),
-                              tr( "WARNING: You have entered a password. It will be stored in plain text in your project files and in your home directory on Unix-like systems, or in your user profile on Windows. If you do not want this to happen, please press the Cancel button.\nNote: Giving the password is optional. It will be requested interactively, when needed." ),
+                              tr( "WARNING: You have entered a password. It will be stored in unsecured plain text in your project files and your home directory (Unix-like OS) or user profile (Windows). If you want to avoid this, press Cancel and either:\n\na) Don't provide a password in the connection settings — it will be requested interactively when needed;\nb) Use the Configuration tab to add your credentials in an HTTP Basic Authentication method and store them in an encrypted database." ),
                               QMessageBox::Ok | QMessageBox::Cancel ) == QMessageBox::Cancel )
   {
     return;

src/providers/postgres/qgspgnewconnection.cpp

@@ -115,7 +115,7 @@ void QgsPgNewConnection::accept()
   if ( !hasAuthConfigID && chkStorePassword->isChecked() &&
        QMessageBox::question( this,
                               tr( "Saving passwords" ),
-                              tr( "WARNING: You have opted to save your password. It will be stored in plain text in your project files and in your home directory on Unix-like systems, or in your user profile on Windows. If you do not want this to happen, please press the Cancel button.\n" ),
+                              tr( "WARNING: You have opted to save your password. It will be stored in unsecured plain text in your project files and in your home directory (Unix-like OS) or user profile (Windows). If you want to avoid this, press Cancel and either:\n\na) Don't save a password in the connection settings — it will be requested interactively when needed;\nb) Use the Configuration tab to add your credentials in an HTTP Basic Authentication method and store them in an encrypted database." ),
                               QMessageBox::Ok | QMessageBox::Cancel ) == QMessageBox::Cancel )
   {
     return;