refs #5192 simplified admin menu since it is very confusing for developers to find the correct translation key to use for menuName. Results in lots of dulicated code as well (same translation keys are mentioned everywhere). Also removed the $displayedForCurrentUsers in those methods since boolean parameters are bad practice and it did result in duplicated code as well as you had to call the same function or pass the same variable in each add() call. Moved the VisitorGenerator in a development section since it is not really diagnostic. There will be another development menu item with the next commit. Need to update ui tests
refs #5863 added a page in the admin to search for english translations and keys. Will be only shown if development mode is enabled. Very useful for plugin developers who want to reuse existing translations