Change links to buttons

- more semantically accurate, will expose these as buttons to assistive technologies
- note: while having block-level elements like `<div>` inside a `<button>` is an html validation error, it does not affect functionality as long as there's no more structure inside it

src/popup/accounts/lock.component.html

@@ -23,11 +23,11 @@
                             class="monospaced" [(ngModel)]="masterPassword" required appInputVerbatim>
                     </div>
                     <div class="action-buttons">
-                        <a class="row-btn" href="#" appStopClick appBlurClick
+                        <button type="button" class="row-btn" appStopClick appBlurClick
                             appA11yTitle="{{'toggleVisibility' | i18n}}" (click)="togglePassword()">
                             <i class="fa fa-lg" [ngClass]="{'fa-eye': !showPassword, 'fa-eye-slash': showPassword}"
                                 aria-hidden="true"></i>
-                        </a>
+                        </button>
                     </div>
                 </div>
             </div>
@@ -38,11 +38,11 @@
         </div>
         <div class="box" *ngIf="biometricLock">
             <div class="box-footer">
-                <button class="btn primary block" (click)="unlockBiometric()" appStopClick>{{'unlockWithBiometrics' | i18n}}</button>
+                <button type="button" class="btn primary block" (click)="unlockBiometric()" appStopClick>{{'unlockWithBiometrics' | i18n}}</button>
             </div>
         </div>
         <p class="text-center">
-            <a href="#" appStopClick (click)="logOut()">{{'logOut' | i18n}}</a>
+            <button appStopClick (click)="logOut()">{{'logOut' | i18n}}</button>
         </p>
     </content>
 </form>