message: feat(account-share): styling & refactoring
diff: -<ion-header transparent no-border>
  - <ion-toolbar transparent>
  +<ion-header no-border>
  + <ion-toolbar>
  + <ion-buttons slot="start">
  + <ion-back-button></ion-back-button>
  + </ion-buttons>
  <ion-title>
  - <ion-text>
  - <p color="white">{{ 'wallet-share.title' | translate }}</p>
  - </ion-text>
  + {{ 'wallet-share.title' | translate }}
  </ion-title>
  </ion-toolbar>
  </ion-header>
  -<ion-content padding class="colored-background">
  +<ion-content class="ion-padding">
  <h3 padding-bottom [innerHTML]="'wallet-share.heading' | translate"></h3>
  <ion-row justify-content-center padding-bottom>
  </ion-row>
  <ion-row><p [innerHTML]="'wallet-share.text' | translate"></p></ion-row>
  -</ion-content>
  -<ion-footer no-border>
  - <ion-toolbar padding transparent>
  - <ion-row justify-content-end>
  - <ion-button default color="primary" (click)="done()" shape="round" item-right>{{ 'wallet-share.done_label' | translate }}</ion-button>
  - </ion-row>
  - </ion-toolbar>
  -</ion-footer>
  + <ion-fab vertical="bottom" horizontal="end" slot="fixed">
  + <ion-button color="primary" shape="round" (click)="done()">{{ 'wallet-share.done_label' | translate }}</ion-button>
  + </ion-fab>
  +</ion-content>
  