GUACAMOLE-36: Migrate guacLogin and guacNotification to TranslatableMessage.

...rc/main/webapp/app/client/controllers/clientController.js

.../src/main/webapp/app/index/controllers/indexController.js

guacamole/src/main/webapp/app/login/directives/login.js

guacamole/src/main/webapp/app/login/templates/login.html

...bapp/app/manage/controllers/manageConnectionController.js

...app/manage/controllers/manageConnectionGroupController.js

.../app/manage/controllers/manageSharingProfileController.js

...ain/webapp/app/manage/controllers/manageUserController.js

...main/webapp/app/notification/services/guacNotification.js

...n/webapp/app/notification/templates/guacNotification.html

...le/src/main/webapp/app/notification/types/Notification.js

...webapp/app/settings/directives/guacSettingsPreferences.js

...in/webapp/app/settings/directives/guacSettingsSessions.js