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-saml/src/main/resources/guac-manifest.json

@@ -11,7 +11,8 @@
 
     "translations" : [
         "translations/ca.json",
-        "translations/en.json"
+        "translations/en.json",
+        "translations/pt.json"
     ]
 
 }

extensions/guacamole-auth-saml/src/main/resources/translations/pt.json

@@ -0,0 +1,12 @@
+{
+
+    "DATA_SOURCE_SAML" : {
+        "NAME" : "SAML Authentication Extension"
+    },
+
+    "LOGIN" : {
+        "FIELD_HEADER_SAML"     : "",
+        "INFO_SAML_REDIRECT_PENDING" : "Por favor aguarde, redirecionando para o provedor de indentidade..."
+    }
+
+}