New Flag/Language option does not appear on the page/skin after adding a new language through Admin > Language. However, if you add another language then you do see flags of the newly added languages but not of default language so there is no way to switch back to english. 

The UI says that default language cannot be disabled; however, the Enabled checkbox is not checked. I was able to get the default flag to appear after manually adding a record to PortalLanguages table. 

Is the default language suppose to be in that table? If no, it should still be visible on the skin for users to switch back. Furthermore, it requires you add at least two languages to the portal before the flags appear on skin.