Revert "Updating launch images to reflect new design."

This reverts commit d10dad25986598e72d529a798958ceb9f8bbb54e.
Changing Add Sites screen to show site url when the site has no title.
Removing languages that render as tofu's on the phone.
Adding TOS label to Create Account flow in NUX.
Updated a few assets in the NUX.

* Updated About Button
* Updated Help Button
* Updated Back Button
Fixed an issue where the page control on the NUX walkthroughs wasn't centering on iPad.
Adding error messages for account creation and modifying some previous NUX related text.
Adding localized strings for the user/site creation error messages.
Updating NUX Strings to not use code like names for localization keys.
Tweaking the password string.
Updating some strings related to localization.
Modifying some all caps localized strings for the NUX to be lower case.
Fixing some typos in localized strings.
Fixed bug where create account flow improperly displayed the limit reached error.
Moving TOS Labels on Create Account Flow to be below buttons.
Fixed centering issue on Create Account Flow.
Adding more detailed error messages to create account flow.
Adding language to Mixpanel stats.
Merge remote-tracking branch 'sendhil/add-nux-welcome' into add-nux-welcome