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* DEV: Show warning message when using ember css selectors When editing the theme css via the admin UI a warning message will be displayed if it detects that the `#emberXXX` or `.ember-view` css selectors are being used. These are dynamic selectors that ember generates, but they can change so they should not be used. * Update error message text to be more helpful * Display a warning instead of erroring out This allows the theme to still be saved, but a warning is displayed. Updated the tests to check for the error message. Updated the pre tags css so that it wraps for long messages.