Bug/mobile 14

* When logging in with PIN, a broken layout appears for a sec or so. fixes #2048
* A short delay after input the last PIN number. fixes #2042
* Back link as a button. fixes #2029
* Fixes of some unlogged layout issues.
* Swipe action to change pages (using bottom bar menu as reference). 
* Swipe action to show/hide sidebars. fixes #2010
ok with this, but please add a 'loading' (maybe a bitcoin spinner) to the send button, once the 4 digit is entered. Now the 'send' button appear grayed, and it is kind of confusing (for a sec).