Put radiobuttons instead of checkboxes for mail from setting

src/views/app.html

@@ -851,9 +851,19 @@
       <div class="card" ng-show="view === 'email'">
         <div class="row">
           <div class="col-md-12">
-            <label class="control-label"><input type="checkbox" ng-model="email.enableMailbox">
-              {{ 'app.email.from.enable' | tr }}
-            </label>
+            <div class="radio">
+              <label>
+                <input type="radio" ng-model="email.enableMailbox" value="0"> {{ 'app.email.from.disable' | tr }}
+              </label>
+            </div>
+
+            <p class="small">Some description what this does</p>
+
+            <div class="radio">
+              <label>
+                <input type="radio" ng-model="email.enableMailbox" value="1"> {{ 'app.email.from.enable' | tr }}
+              </label>
+            </div>
 
             <p ng-bind-html="'app.email.from.description2' | tr:{ domain: app.domain, domainConfigLink: ('/#/email/' + app.domain) }"></p>