[fix] Readonly mode: hide user menu items, in small device
[fix] Help tour: Fix last help tour message, on readonly mode
[fix] Help: HIde login/join help entries, on readonly mode

[fix] Demo mode: add ribbon on home page. Fix warn template use
[fix] API: allow to pay using the API, but display a warn message

[fix] Fix i18n ES json format

[fix] Transfer: display loading spinner when loading wallet
[fix] Wallets: display alert when unable to remove secondary wallet + simplify code

[fix] Enforce use of angular-translate, when some keys are not defined (avoid error "translationId must be a not empty string")