GUACAMOLE-1207: Portuguese I18N. Add portuguese translation

Add translation files for the webapp and the following extensions:
  - guacamole-auth-cas
  - guacamole-auth-duo
  - guacamole-auth-jdbc
  - guacamole-auth-openid
  - guacamole-auth-quickconnect
  - guacamole-auth-saml
  - guacamole-auth-totp

extensions/guacamole-auth-jdbc/modules/guacamole-auth-jdbc-sqlserver/src/main/resources/guac-manifest.json

@@ -25,6 +25,7 @@
         "translations/es.json",
         "translations/fr.json",
         "translations/ja.json",
+        "translations/pt.json",
         "translations/ru.json"
     ]